Agilent Technologies 81480A, 81640A, 81642A, 81680A, 81689A User Manual

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Agilent 81480A and

Agilent 81680A, 81640A, 81682A, 81642A, & 81689A

Tunable Laser Modules

User’s Guide

Notices

This document contains proprietary information that is protected by copyright. All rights are reserved.

No part of t his doc ument ma y reprodu ced in (inc luding electronic storage and retrieval or translation into a foreign language) without prior agreement and written consen t fro m Agilent T echno logie s Deu tschlan d Gm bH as governed by United States and international copywright laws.

Copyr ight 20 01 by: Agilent Technologies Deutschland GmbH Herrenberger Str. 130 71034 Böblingen Germany

Subject Matter

The material in this document is subject to change without notice.

Agilent Technologies makes n o warran ty of an y kind

with rega rd to this p rint ed ma teri al, inclu ding , but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Printing History

New editions are complete revisions of the guide reflecting alterations in the functionality of the instrument. Updates are occasionally made to the guide betwee n editio ns. The date on the titl e page changes when an updated guide is published. To find out the current revision of the guide, or to purchase an updated guide, contact your Agilent Technologies representative.

Control Serial Number: First Edition applies directly to all instruments.

Warranty

This Agilent Technologies instrument product is war rante d agains t defect s in m ate rial and workm anship for a period of one year from date of shipment. During the warranty period, Agilent will, at its option, either repair or replace products that prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by Agilent. Buyer shall prepay shipping charges to Agilent and Agilent shall pay shipping charges to return the product to Bu yer. How ever, Buye r shall pa y all shi pping char ges, duties, and taxes for products returned to Agilent from another country.

Agilent warrants that its software and firmware designated by Agilent for use with an instrument will execute its programming instructions when properly installed on that instrument. Agilent does not warrant that the operation of the instrument, software, or firm ware wil l be un inte rrupted or e rror fr ee.

Exclusive Remedies

The remedies provided herein are Buyer’s sole and exclus ive remed ies. Agi lent Tech nologies shall no t be liable for any direct, indirect, special, incidental, or conse quent ial damag es whe ther based on contra ct, tort, or any other legal theory.

Assistance

Product maintena nce agreem ents and other cus tomer assistance agreements are available for Agilent Technologies products. For any assistance contact your nearest Agilent Technologies Sales and Service Office.

Certification

Agilent Technologies Inc. certifies that this product met its published specifications at the time of shipment from the factory.

Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Technology, NIST (formerly the United States National Bureau of Sta ndar ds, N BS) t o the exte nt allowed by the In sti tutes ’s calibration facility, and to the calibration facilities of other International Standards Organization members.

ISO 9001 Certification

Produced to ISO 9001 international quality system standard as part of our objective of continually increasin g custome r satisfac tion throug h improved process c ontrol.

Sixth Edition 81680-90014 E0101

First Edition: E0599: May 1999

Second Edition: E1099: October 1999

Third Edition: E1299: December 1999

Fourth Edition: E0300: March 2000

Fifth Edition: E0900: September 2000

Sixth Edition: E0101: January 2001

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance.

No oth er warran ty is expre ssed or implied. Agilent Technologies specifically disclaims the implied warranties of Merchantability and Fitness for a Particular Purpose.

2 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Safety Summary

WARNING The WARNING sign denotes a hazard. It calls attention to a procedure,

Safety Summary

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Agilent Technologies Inc. assumes no liability for the customer’s failure to comply with these requirements.

Before operation, review the instrument and manual, including the red safety page, for safety markings and instructions. You must follow these to ensure safe operation and to maintain the instrument in safe condition.

practice or the like, which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a WAR N I NG sign u ntil th e indica t ed conditions ar e fully u nd ersto od a nd met.

Safety Symbols

The apparatus will be marked with this symbol when it is necessary for the user to refer to the instruction manual in order to protect the apparatus against damage.

Hazardous laser radiation.

Initial Inspection

Inspect the shipping container for damage. If there is damage to the container or cushioning, keep them until you have checked the contents of the shipment for completeness and verified the instrument both mechanically and electrically.

The Performance Tests give procedures for checking the operation of the instrument. If the contents are incomplete, mechanical damage or defect is apparent, or if an instrument does not pass the operator’s checks, notify the nearest Agilent Technologies Sales/Service Office.

WARNING To avoid hazardous electrical shock, do not perform electrical tests

when there are signs of shipping damage to any portion of the outer enclosure (covers, panels, etc.).

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 3

Safety Summary

WARNING You MUST return instruments with malfunctioning laser modules to

an Agilent Technologies Sales/Service Center for repair and calibration.

Line Power Requirements

The Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A, Agilent 81642A, & Agilent 81689A Tunable Laser Modules operate when installed in the Agilent 8164A Lightwave Measurement System. The Agilent 81689A also operates when installed in the Agilent 8163A Lightwave Multimeter or Agilent 8166A Lightwave Multichannel System.

Operating Environment

The safety information in the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave Multichannel System User’s Guide summarizes the operating ranges for the Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A, Agilent 81642A, & Agilent 81689A Tunable Laser Modules. In order for these modules to meet specifications, the operating environment must be within the limits specified for your mainframe.

Input/Output Signals

CAUTION There are two BNC connectors on the front panel of the

Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A, and Agilent 81642A; a BNC input connector and a BNC output connector.

There is one BNC connector on the front panel of the Agilent 81689A a BNC input connector.

An absolute maximum of ±6 V can be applied as an external voltage to any BNC connector.

Storage and Shipment

This module can be stored or shipped at temperatures between

−40°C and +70°C. Protect the module from temperature extremes that may cause condensation within it.

4 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Safety Summary

Initial Safety Information for Tunable Laser Modules

The Specifications for these modules are as follows:

Table 1 Tunable Laser Modules Laser Safety Information

Agilent 81480A Agilent 81680A Agilent 81640A Agilent 81682A Agilent 81642A Agilent 81689A

Laser Type FP-Laser

InGaAsP

Wav elengt h range 1370-1480 nm 1400-1670 nm 1400-1670 nm 1400-1670 nm 1400-1670 nm 1400-1670 nm

Max. CW output power* <15 mW <15 mW <15 mW <15 mW <15 mW <15 mW

Beam waist diameter 9 µm9 µm9 µm9 µm9 µm9 µm

Numerical aperture 0.1 0.1 0.1 0.1 0.1 0.1

Laser Class according to IEC 60825-1 (1998)- International

Max. permissible CW output power - IEC**

Laser Class according to FDA 21 CFR 1040.10 (1995) - USA

Max. permissible CW output power - FDA**

* Max. CW output power is defined as the highest possible optical power that the laser source can produce at its output connector. ** Max. permissible CW output power is the highest optical power that is permitted within the appropriate laser class.

3A 3A 3A 3A 3A 3A

50 mW 50 mW 50 mW 50 mW 50 mW 50 mW

IIIb IIIb IIIb IIIb IIIb IIIb

500 mW 500 mW 500 mW 500 mW 500 mW 500 mW

FP-Laser InGaAsP

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 5

Laser Safety Labels

These laser safety warning labels are fixed on the outside of the Agilent 8164A Lightwave Measurement System before shipment.

Safety Summary

Figure 1 USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A)

These laser safety warning labels are fixed on the outside of the Agilent 8164A Lightwave Measurement System before shipment.

Figure 2 Non-USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A)

6 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Safety Summary

A sheet of laser safety warning labels are included with the instrument. You MUST stick the labels in the local language onto the outside of the instrument, in a position where they are clearly visible to anyone using the instrument.

Top Vi e w

See page 6See page 6

Figure 3 Position of Safety Labels on Backloadable Tunable Laser Modules

These labels are applied in these positions to every Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A, and Agilent 81642A Tunable Laser Module before shipment.

See page 6

Figure 4 Position of Safety Labels on Agilent 81689A Tunable Laser Module

These labels are applied in these positions to every Agilent 81689A Tunable Laser Module before shipment.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 7

See page 6

Safety Summary

WARNING Please pay attention to the following laser safety warnings:

• Under no circumstances look into the end of an optical cable

attached to the optical output when the device is operational. The

laser radiation can seriously damage your eyesight.

• Do not enable the laser when there is no fiber attached to the optical

output connector.

• The laser is enabled by pressing the gray button close to the optical

output connector on the front panel of the module. The laser is on

when the green LED on the front panel of the instrument is lit.

• The use of optical instruments with this product will increase eye

hazard.

• The laser module has a built-in safety circuitry which will disable

the optical output in the case of a fault condition.

WARNING Refer Servicing only to qualified and authorized personnel.

8 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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The Structure of this Manual

This manual is divided into two categories:

• Getting Started

This section gives an introduction to the Tunable Laser modules.

and aims to make these modules familiar to you:

– “Getting Started with Tunable Laser Sources” on page 21.

• Additional Information

This is supporting information of a non-operational nature. this

contains information concerning accessories, specifications, and

performance tests:

– “Accessories” on page 31,

– “Specifications” on page 39, and

– “Performance Tests” on page 57.

Conventions used in this manual

• Hardkeys are indicated by italics, for example, Config, or Channel.

• Softkeys are indicated by normal text enclosed in square brackets,

for example, [Zoom] or [Cancel].

• Parameters are indicated by italics enclosed by square brackets, for

example, [Range Mode], or [MinMax Mode].

• Menu items are indicated by italics enclosed in brackets, for

example, <MinMax>, or <Continuous>.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 9

The Structure of this Manual

10 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Tabl e of C o nt e nts

Tab l e o f Co n t e n t s

Safety Summary 3

Safety Symbols 3 Initial Inspection 3 Line Power Requirements 4 Operating Environment 4 Input/Output Signals 4 Storage and Shipment 4 Initial Safety Information for Tunable Laser Modules 5 Laser Safety Labels 6

The Structure of this Manual 9

Conventions used in this manual 9

Getting Started with Tunable Laser Sources 21

What is a Tunable Laser ? 23

Agilent 81480A, 81680A/82A/40A/42A Tunable Laser Modules

Agilent 81689A Tunable Laser Module 26

Optical Output 27

Polarization Maintaining Fiber 27 Angled and Straight Contact Connectors 27

Signal Input and Output 29

Accessories 31

Modules and Options 33 Modules 34

User’s Guides 35 Options 35

Option 003 - Agilent 81682A, Agilent 81642A 35

Option 021 - Agilent 81689A 35 Option 022 - Agilent 81689A 36 Option 071 - All Tunable Laser Modules 36

Option 072 - All Tunable Laser Modules 36

Connector Interfaces and Other Accessories 36

Options 071, 021: Straight Contact Connectors 36

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 11

Table o f Co n ten t s

Specifications 39

Options 072, 022: Angled Contact Connectors 37

Definition of Terms 41

Absolute Wavelength Accuracy 41 Effective Linewidth 41 Linewidth 42 Minimum Output Power 42 Mode-Hop Free Tuning Range 42 Modulation Extinction Ratio 42 Modulation Frequency Range 43 Output Power 43 Output Isolation 43 Peak Power 43 Polarization Extinction Ratio 43 Power Flatness Over Modulation 44 Power Flatness Versus Wavelength 44 Power Linearity 44 Power Repeatability 44 Power Stability 45 Relative Intensity Noise (RIN) 45 Relative Wavelength Accuracy 45 Return Loss 45 Sidemode Suppression Ratio 46 Signal-to-Source Spontaneous Emission (SSE) Ratio 46 Signal-to-Total-Source Spontaneous Emission 46 Wavelength Range 47 Wavelength Repeatability 47 Wavelength Resolution 47 Wavelength Stability 47

Tunable Laser Module Specifications 48 Supplementary Performance Characteristics 54

Operating Modes 54

Internal Digital Modulation 1 54 External Digital Modulation 1 54

External Analog Modulation 1 54 External Wavelength Locking (Agilent 81680A/40A/82A/42A) 54 Coherence Control (Agilent 81680A/40A/82A/42A) 54

Continuous Sweep (Agilent 81680A/40A/82A/42A) 55

12 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Tab l e o f Co n t e n t s

Stepped Mode (Agilent 81680A/40A/82A/42A) 55

General 55

Output Isolation (typ.): 55

Return loss (typ.): 55 Polarization Maintaining Fiber (Options 071, 072): 55 Laser Class: 55

Recalibration Period: 56 Warm-up Time: 56 Environmental 56

Storage Temperature: 56 Operating Temperature: 56 Humidity: 56

Performance Tests 57

Required Test Equipment 59

Test Record 60 Test Failure 60 Instrument Specification 60

Performance Test Instructions 61

General Test Setup 61 Wavelength Tests 61

General Settings of Wavelength Meters for all Wavelength Tests 62

Wavelength Accuracy 62

Relative Wavelength Accuracy 62 Absolute Wavelength Accuracy 64

Mode Hop Free Tuning 64

Wavelength Repeatability 65 Power Tests 67

Calibration of the Agilent 81001FF Attenuation Filter 67

Maximum Output Power 69

Power Linearity 71

Power Linearity - Low Power Test 71 Example (Agilent 81680A Output 1) 73 Power Linearity - High Power Test 73

Power Linearity - Test Using Attenuation 75

Power Flatness over Wavelength 76

Power Flatness over Wavelength - Without Attenuation 76 Power Flatness over Wavelength - Using Attenuation 77

Power Stability 79 Signal-to-Source Spontaneous Emission 81

Signal-to-Source Spontaneous Emission Tests - High Power Outputs

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 13

Table o f Co n ten t s

Signal-to-Source Spontaneous Emission Tests - Low SSE Outputs 83

Signal-to-Total-Source Spontaneous Emission 88

Signal to Total SSE Tests - Low SSE Outputs 89 Optional Test 95 S i gna l t o To t al SS E Tes t s - H ig h P o we r Ou t pu ts 95

Te st Re c o r d 99

Agilent 81480A Performance Test 99 Test Equipment Used 100

Relative Wavelength Accuracy 101 Mode Hop Free Tuning 103

Wavelength Repeatability 104 Maximum Power Test 105 Power Linearity Output 1, Low SSE 106

Power Linearity Output 2, High Power Upper Power Levels 106 Power Linearity Output 2, High Power by attenuator 107 Power Flatness 108

Power Stability 109 Signal-to-Source Spontaneous Emission - 81480A Output 2, High

Power 109 Signal-to-Source Spontaneous Emission - 81480A Output 1, Low SSE

110

Signal-to-Total-Source Spontaneous Emission - 81480A Output 1, Low SSE 111

Optional Test: Signal-to-Total-Source Spontaneous Emission - 81480A Output 2, High Power 111

Agilent 81680A Performance Test 113 Test Equipment Used 114

Relative Wavelength Accuracy 115 Mode Hop Free Tuning 117 Wavelength Repeatability 118

Maximum Power Test 119 Power Linearity Output 1, Low SSE 120 Power Linearity Output 2, High Power Upper Power Levels 120

Power Linearity Output 2, High Power by attenuator 121 Power Flatness 122 Power Stability 123

Signal-to-Source Spontaneous Emission - 81680A Output 2, High Power 123

Signal-to-Source Spontaneous Emission - 81680A Output 1, Low SSE 124

Signal-to-Total-Source Spontaneous Emission - 81680A Output 1, Low SSE 125

Optional Test: Signal-to-Total-Source Spontaneous Emission - 81680A

14 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Tab l e o f Co n t e n t s

Output 2, High Power 125

Agilent 81640A Performance Test 127

Te s t E q ui pm en t Us e d 1 2 8

Relative Wavelength Accuracy 129 Relative Wavelength Accuracy Summary of all Repetitions 130 Relative Wavelength Accuracy Result 130

Absolute Wavelength Accuracy Result 130 Mode Hop Free Tuning 131 Wavelength Repeatability 132

Maximum Power Test 133 Power Linearity Output 1, Low SSE134 Power Linearity Output 2, High Power Upper Power Levels 134

Power Linearity Output 2, High Power by Attenuator 135 Power Flatness 136 Power Stability 137

Signal-to-Source Spontaneous Emission - 81640A Output 2, High Power 137

Signal-to-Source Spontaneous Emission - 81640A Output 1, Low SSE 138

Signal-to-Total-Source Spontaneous Emission - 81640A Output 1, Low SSE 139

Optional Test - Signal-to-Total-Source Spontaneous Emission - 81640A Output 2, High Power 139

Agilent 81682A Performance Test 141

Te s t E q ui pm en t Us e d 1 4 2 Relative Wavelength Accuracy 143 Mode Hop Free Tuning 145

Wavelength Repeatability 146 Maximum Power Test 147 Power Linearity - 81682A 147

Power Linearity 81682A #003 Upper Power Levels 148 Power Linearity 81682A #003 by Attenuator 149 Power Flatness 150

Power Stability 151 Signal-to-Source Spontaneous Emission - 81682A 151 Optional Test: Signal-to-Total-Source Spontaneous Emission - 81682A

152

Agilent 81642A Performance Test 153

Te s t E q ui pm en t Us e d 1 5 4

Relative Wavelength Accuracy 155 Mode Hop Free Tuning 157 Wavelength Repeatability 158

Maximum Power Test 159 Power Linearity - 81642A 159 Power Linearity 81642A #003 Upper Power Levels 160

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 15

Table o f Co n ten t s

Cleaning Information 171

Power Linearity 81642A #003 by Attenuator 161

Power Flatness 162 Power Stability 163 Signal-to-Source Spontaneous Emission - 81642A 163

Optional Test: Signal-to-Total-Source Spontaneous Emission - 81642A 164

Agilent 81689A Performance Test 165

Tes t E qui pme nt U s ed 1 66 Relative Wavelength Accuracy 167 Wavelength Repeatability 168

Maximum Power Test 169 Power Linearity 169 Power Flatness 170

Power Stability 170 Signal-to-Source Spontaneous Emission 170

Safety Precautions 173 Why is it important to clean optical devices? 173 What do I need for proper cleaning? 174

Standard Cleaning Equipment 174

Dust and shutter caps 174 Isopropyl alcohol 175

Cotton swabs 175 Soft tissues 176 Pipe cleaner 176

Compressed air 176

Additional Cleaning Equipment 177

Microscope with a magnification range about 50X up to 300X 177 Ultrasonic bath 177 Warm water and liquid soap 178

Premoistened cleaning wipes 178 Polymer film 178 Infrared Sensor Card 178

Preserving Connectors 179 Cleaning Instrument Housings 179 Which Cleaning Procedure should I use ? 180 How to clean connectors 180 How to clean connector adapters 181 How to clean connector interfaces 182

16 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Tab l e o f Co n t e n t s

How to clean bare fiber adapters

183

How to clean lenses 184 How to clean instruments with a fixed connector interface

184

How to clean instruments with an optical glass plate 185 How to clean instruments with a physical contact interface

185

How to clean instruments with a recessed lens interface

186

How to clean optical devices which are sensitive to mechanical stress and pressure

187

How to clean metal filters or attenuator gratings 188 Additional Cleaning Information 189

How to clean bare fiber ends 189 How to clean large area lenses and mirrors 189

Other Cleaning Hints 191

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 17

Table o f Co n ten t s

18 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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List of Figures

Figure 1 USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A) . . 6 Figure 2 Non-USA Safety Labels (81480A, 81680A, 81640A, 81682A, 81642A, 81689A) 6 Figure 3 Position of Safety Labels on Backloadable Tunable Laser Modules . . . 7 Figure 4 Position of Safety Labels on Agilent 81689A Tunable Laser Module . . . 7 Figure 5 Agilent 81480A Tunable Laser Module (straight contact connectors) . . . 24 Figure 6 Agilent 81680A Tunable Laser Module (straight contact connectors) . . . 24 Figure 7 Agilent 81682A Tunable Laser Module (straight contact connector) . . . 24 Figure 8 Agilent 81640A Tunable Laser Module (straight contact connectors) . . . 24 Figure 9 Agilent 81642A Tunable Laser Module (straight contact connectors) . . . 24

Figure 10 Agilent 81689A Tunable Laser Module . . . . . . . . . . 26

Figure 11 PMF Output Connector . . . . . . . . . . . . . . 27

Figure 12 Angled and Straight Contact Connector Symbols . . . . . . . . 28

Figure 13 Agilent 81682A Tunable Laser Module (angled contact connector) . . . 28

Figure 14 Mainframes, Tunable Laser Modules, and Options . . . . . . . 33

Figure 15 Options 021, 071: Single-mode fiber/PMF with Straight Contact Connectors . 37 Figure 16 Options 022, 072: Single-mode fiber/PMF with Angled Contact Connectors . 38

Figure 17 Test Setup for Wavelength Tests . . . . . . . . . . . . 61

Figure 18 Calibration of the Agilent 81001FF Attenuation Filter, Reference Setup . . 67

Figure 19 Test Setup for Calibrating the Agilent 81001FF Attenuation Filter . . . . 68

Figure 20 Test Setup for the Maximum Output Power Tests. . . . . . . . 69

Figure 21 Test Setup for Low Power Linearity Tests. . . . . . . . . . 71

Figure 22 Test Setup for the Source Spontaneous Emission Test - High Power Outputs . 81

Figure 23 Transmission Characteristic of Fiber Bragg Grating . . . . . . . 84

Figure 24 Signal-to-Spectral SSE Measurement . . . . . . . . . . 84

Figure 25 Test Setup for Source Spontaneous Emission Test . . . . . . . 85

List of Figures

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 19

List of Figures

20 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Getting Started with Tunable Laser Sources

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 21

Getting Started with Tunable Laser Sources

This chapter describes the Agilent 81480A, Agilent 81680A,

Agilent 81640A, Agilent 81682A, Agilent 81642A, and Agilent 81689A

Tunable Laser modules.

22 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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What is a Tunable Laser ? Getting Started with Tunable Laser Sources

What is a Tunable Laser ?

A Tunable Laser is a laser source for which the wavelength can be varied through a specified range. The Agilent Technologies range of Tunable Laser modules also allow you to set the output power, and to choose between continuous wave or modulated power.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 23

Getting Started with Tunable Laser Sources What is a Tunable Laser ?

Agilent 81480A, 81680A/82A/40A/42A Tunable Las er Modules

Figure 5 Agilent 81480A Tunable Laser Module (straight contact connectors)

Figure 6 Agilent 81680A Tunable Laser Module (straight contact connectors)

Figure 7 Agilent 81682A Tunable Laser Module (straight contact connector)

Figure 8 Agilent 81640A Tunable Laser Module (straight contact connectors)

Figure 9 Agilent 81642A Tunable Laser Module (straight contact connectors)

24 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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What is a Tunable Laser ? Getting Started with Tunable Laser Sources

The Agilent 81480A and 81680A/82A/40A/42A Tunable Laser modules are back-loadable modules. To fit these modules into the Agile nt 8164A mainframe see “How to Fit and Remove Modules” in th e Agilent 8163A Lightwave Multimeter, Agilent 8164A, Lightwave Measurement System, & Agilent 8166A Lightwave Multichannel SystemUser’s Guide.

The Agilent 81480A and 81680A/82A/40A/42A Tunable Laser modules have a built-in wavelength control loop to ensure high wavelength accuracy. As these modules are all mode-hop free tunable with continuous output power, they qualify for the test of the most critical dense-Wavelength Division Multiplexer (dWDM) components.

The Agilent 81480A and Agilent 81640A/80A Tunable Laser modules are equipped with two optical outputs:

• Output 1, the Low SSE output, delivers a signal with ultra-low

source spontaneous emission (SSE). It enables accurate crosstalk

measurement of DWDM components with many channels at narrow

spacing. You can characterize steep notch filt ers such as Fiber

Bragg Gratings by using this output and a power sensor module.

• Output 2, the High Power output, delivers a signal with high optical

power. You can adjust the signal by more than 60 dB by using the in-

built optical attenuator.

The Agilent 81682A/42A Tunable Laser module delivers a signal with high optical power. If you choose O ption 0 03 , you can adjust the signal by more than 60 dB by using the in-built optical attenuator.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 25

Getting Started with Tunable Laser Sources What is a Tunable Laser ?

Agilent 81689A Tunable Laser Module

Agilent 81689A with

Straight Contact Connector

Figure 10 Agilent 81689A Tunable Laser Module

The Agilent 81689A Tunable Laser module is a front-loadable module. To insert this module into the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System or Agilent 8166A Lightwave Multichannel System see “How to Fit and Remove Modu les” in the Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement System, & Agilent 8166A Lightwave Multichannel System User’s Guide.

You can use the Agilent 81689A Tunable Laser module to set up a realistic multi-channel test-bed for DWDM transmission systems. Its continuous, mode-hop free tuning makes it quick and easy to set even the most complex configurations to the target wavelengths and power levels.

The Agilent 8163A Lightwave Multimeter, a Power Sensor module,and a Agilent 81689A Tunable Laser module together represent a smart loss-test set with selectable wavelength.

Agilent 81689A with

Angled Contact Connector

26 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Optical Output Getting Started with Tunable Laser Sources

Optical Output

Polarization Maintaining Fiber

If you have an instrument with a polarization maintaining fiber (PMF), the PMF is aligned to maintain the state of polarization.

The fiber is of Panda type, with TE mode in the slow axis in line with the connector key. A well defined state of polarization ensures constant measurement conditions.

The Agilent 81480A and 81680A/40A/82A/42A Tunable Laser modules are equipped with PMF outputs as standard.

For the Agilent 81689A Tunable Laser module, PMF output is available as an option.

Stress Rods

Figure 11 PMF Output Connector

Angled and Straight Contact Connectors

Angled contact connectors help you to control return lo ss. With angled fiber endfaces, reflected light tends to reflect into the cladding, reducing the amount of light that reflects back to the source.

Connector Key

Fiber Cladding

Fiber Core

(8-µm Diameter)

Slow Axis (Polarization Axis)

Not to Scale

The Agilent 81480 and 81680A/40A/82A/42A/89A Tunable Laser modules can have the following connector interface options:

• Option 071, Polarization-maintaining fiber straight contact

connectors, or

• Option 072, Polarization-maintaining fiber angled contact

connectors.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 27

Getting Started with Tunable Laser Sources Optical Output

Two additional connector interface options are available for the Agilent 81689A Tunable Laser module:

• Option 021, Standard single-mode fiber straight contact connectors,

• Option 022, Standard single-mode fiber angled contact connectors.

CAUTION If the contact connector on your instrument is angled, you can only

use cables with angled connectors with the instrument.

Angled Contact

Connector Symbol

Figure 12 Angled and Straight Contact Connector Symbols

Figure 12 shows the symbols that tell you whether the contact connector of your Tunable Laser module is angled or straight. The angled contact connector symbol is colored green.

Figure 7 and Figure 13 show the front panel of the Agilent 81682A Tunable Laser module with straight and angled contact connectors respectively.

You should connect straight contact fiber end connectors with neutral sleeves to straight contact connectors and connect angled contact fiber end connectors with green sleeves to angled contact connectors.

NOTE You cannot connect angled non-contact fiber end connectors with

orange sleeves directly to the instrument.

Straight Contact

Connector Symbol

Figure 13 Agilent 81682A Tunable Laser Module (angled contact connector)

See “Accessories” on page 31 for further details on connector interfaces and accessories.

28 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Signal Input and Output Getting Started with Tunable Laser Sources

Signal Input and Output

CAUTION There are two BNC connectors on the front panel of the

Agilent 81480A, Agilent 81680A, Agilent 81680A, Agilent 81640A, Agilent 81682A, and Agilent 81642A - a BNC input connector and a BNC output connector.

There is one BNC connector on the front panel of the Agilent 81689A a BNC input connector.

An absolute maximum of ±6 V can be applied as an external voltage to any BNC connector.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 29

Getting Started with Tunable Laser Sources Signal Input and Output

30 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Accessories

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 31

Accessories

The Agilent 81480A and 81680A/40A/82A/42A/89A Tunable Laser

Source Modules are available in various configurations for the best

possible match to the most common applications.

This chapter provides information on the available options and accessories.

32 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Modules and Options Accessories

Modules and Options

Figure 14 shows all the options that are available for all Tunable Laser modules and the instruments that support these modules.

Agilent 8164A Lightwave Measurement System

Agilent 81480A

Tuna ble Laser

1400 nm

Low SSE

Agilent 81680A

Tuna ble Laser

1550 nm

Low SSE

Option 071

PMF,

Panda-type,

Straight Contact

Option 072

PMF,

Panda-type,

Angled Contact

Agilent 81640A

Tuna ble La se r

1600 nm

Low SSE

Agilent 81682A

Tunable Laser

1550 nm + 8 dBm

Option 003

Attenuator

Agilent 81645A

Filler Module

Agilent 81642A

Tunable Laser

1600 nm + 7 dBm

Option 021

Single-mode

fiber, Straight Contact

Agilent 81689A

Compact

Tuna ble Laser

1550 nm

Option 022

Single-mode

fiber,

Angled

Contact

Agilent 8163A Lightwave Multimeter

Agilent 8163A

Lightwave

Multimeter

Modules

Option 071

PMF,

Panda-type,

Straight Contact

Option 072

PMF,

Panda-type,

Angled

Contact

HP 8153A Lightwave

Multimeter

Modules

Figure 14 Mainframes, Tunable Laser Modules, and Options

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 33

Accessories Modules

Modules

The Agilent 8164A Lightwave Measurement System supports the Agilent 81480A and 81680A/40A/82A/42A/89A Tunable Laser modules. In addition, the Agilent 8163A Lightwave Multimeter supports the Agilent 81689A Tunable Laser module.

Tunable Laser Modules

Model No. Description

Agilent 81480A Tunable Laser for the Test of Critical dense-WDM Components

Agilent 81680A Tunable Laser for the Test of Critical dense-WDM Components

Agilent 81640A Tunable Laser for the Test of Critical Components in both

dense-WDM Bands, the C and L bands

Agilent 81682A Tunable Laser for the Test of Optical Amplifiers and Passive

Components

Agilent 81642A Tunable Laser for the Test of Optical Amplifiers and Passive

Components in both dense-WDM Bands.

Agilent 81689A Tunable Laser for Multi-Channel Test Applications

Filler Module

Model No. Description

Agilent 81645A Filler Module

The Agilent 81645A Filler Module is required to operate the Agile nt 8164A mainframe if it is used without a back-loadable Tunable Laser module. It can be used to:

• prevent dust pollution and

• optimize cooling by guiding the air flow.

See the "Installation and Maintenance" chapter of the Agilent 81480A, Agilent 81680A, Agilent 81682A, Agilent 81640A, & Agilent 81689A Tunable Laser Modules User’s Guide for more details on installing the Agilent 81645A Filler Module.

34 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Modules Accessories

User’s Guides

Opt Description Part No.

Agilent 81480A, Agilent 81680A, Agilent 81682A, Agilent 81640A, & Agilent 81689A Tunable Laser Modules User’s Guide

ABJ Japanese Agilent 81480A, Agilent 81680A, Agilent 81682A,

Agilent 81640A, & Agilent 81689A Tunable Laser Modules User’s Guide

ABF French Agilent 81480A, Agilent 81680A, Agilent 81682A,

Agilent 81640A, & Agilent 81689A Tunable Laser Modules User’s Guide

AB0 Traditional Chinese (Taiwan) Agilent 81480A, Agilent 81680A,

Agilent 81682A, Agilent 81640A, & Agilent 81689A Tunable Laser Modules User’s Guide

AB1 Korean Agilent 81480A, Agilent 81680A, Agilent 81682A,

Agilent 81640A, & Agilent 81689A Tunable Laser Modules User’s Guide

8164A 0B2 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave

Measurement System, & Agilent 8166A Lightwave Multichannel System Programming Guide

8164A 0BF Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave

Measurement System, & Agilent 8166A Lightwave Multichannel System User’s Guide

81680-90014

81680-91514

81680-91214

81680-91714

81680-91814

08164-91016

08164-91011

Options

Option 003 - Agilent 81682A, Agilent 81642A

Built-in optical attenuator with 60 dB attenuation range.

NOTE The Agilent 81640A/80A Tunable Laser Modules have a built-in optical

attenuator as standard for Output 2, the High Power output.

A built-in optical attenuator is not available for the Agilent 81689A.

Option 021 - Agilent 81689A

Standard single-mode fiber, for straight contact connectors.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 35

Accessories Connector Interfaces and Other Accessories

Option 022 - Agilent 81689A

Standard single-mode fiber, for angled contact connectors.

Option 071 - All Tunable Laser Modules

Polarization-maintaining fiber, Panda-type, for straight contact connectors.

Option 072 - All Tunable Laser Modules

Polarization-maintaining fiber, Panda-type, for angled contact connectors.

Connector Interfaces and Other Accessories

The Agilent 81480A and 81680A/40A/82A/42A/89A Tunable Laser modules are supplied with one of two connector interface options:

• Option 071, Polarization-maintaining fiber straight contact

connectors, or

• Option 072, Polarization-maintaining fiber angled contact

connectors.

Two additional connector interface options are available for the Agilent 81689A Tunable Laser module:

• Option 021, Standard single-mode fiber straight contact connectors,

• Option 022, Standard single-mode fiber angled contact connectors.

Options 071, 021: Straight Contact Connectors

If you want to use straight connectors (such as FC/PC, Diamond HMS10, DIN, Biconic, SC, ST or D4) to connect to the instrument, you must do the following:

36 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Connector Interfaces and Other Accessories Accessories

1 Attach your connector interface to the interface adapter.

See Table 2 for a list of the available connector interfaces.

2 Connect your cable (see Figure 15).

Agilent 810

00AI

Connector

Interface

Diamond

HMS-10

Agilent 810

00FI

Connector

Interface

FC/PC/SPC

Agilent 810

00GI

Connector

Interface

Agilent 810

00HI

Connector

Interface

Diamond

E-2000

Agilent 810

00KI

Connector

Interface

Agilent 810

00SI

Connector

Interface

DIN 47256

Agilent 810

00VI

Connector

Interface

Agilent 8100

Connector

Interface

Biconic

Figure 15 Options 021, 071: Single-mode fiber/PMF with Straight Contact Connectors

Table 2 Straight Contact Connector Interfaces

Description Model No.

Biconic Agilent 81000 WI

D4 Agilent 81000 GI

Diamond HMS-10 Agilent 81000 AI

DIN 47256 Agilent 81000 SI

FC / PC / SPC Agilent 81000 FI

SC Agilent 81000 KI

ST Agilent 81000 VI

Diamond E-2000 Agilent 81000 HI

Options 072, 022: Angled Contact

0WI

Connectors

If you want to use angled connectors (such as FC/APC, Diamond HRL10, or SC/APC) to connect to the instrument, you must do the following:

1 Attach your connector interface to the interface adapter.

See Table 3 for a list of the available connector interfaces.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 37

Accessories Connector Interfaces and Other Accessories

2 Connect your cable (see Figure 16).

Agilent 8100

0NI

Connector

Interface FC/APC

Agilent 8100

0KI

Connector

Interface SC/APC

Agilent 8100

0HI

Connector

Interface Diamond E-2108.6

Agilent 8100

0SI

Connector Interface DIN 47256/4108.6

Figure 16 Options 022, 072: Single-mode fiber/PMF with Angled Contact Connectors

Table 3 Angled Contact Connector Interfaces

Description Model No.

DIN 47256-4108.6 Agilent 81000 SI

FC / APC Agilent 81000 NI

SC / APC Agilent 81000 KI

Diamond E-2108.6 Agilent 81000 HI

38 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Specifications

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 39

Specifications

The Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A,

Agilent 81642A and Agilent 81689A Tunable Laser modules are

produced to the ISO 9001 international quality system standard as

part of Agilent Technologies’ commitment to continually increasing

customer satisfaction through improved quality control.

Specifications describe the modules’ warranted performance. Supplementary performance characteristics describe the modules non-warranted typical performance.

Because of the modular nature of the instrument, these performance specifications apply to these modules rather than the mainframe unit.

40 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Definition of Terms Specifications

Definition of Terms

This section defines terms that are used both in this chapter and “Performance Tests” on page 57.

Generally, all specifications apply for the given environmental conditions and after warmup time.

Measurement principles are indicated. Alternative measurement principles of equal value are also acceptable.

Absolute Wavelength Accuracy

The maximum difference between the actual wavelength and the displayed wavelength of the TLS. Wavelength is defined as wavelength in vacuum.

Conditions: constant power level, temperature within operating temperature range, coherence control off, measured at high power output.

Validity: within given time span after wavelength zeroing, at a given maximum temperature difference between calibration and measurement.

Measurement with wavelength meter. Averaging time given by wavelength meter, ≥1 s.

NOTE The abso lute wavelength accuracy of Output 1, the Lo w SSE Ou tput, of

the Agilent 81680A/40A Tunable Laser modules is the same as the absolute wavelength accuracy of Output 2, the High Power Output (guaranteed by design).

Effective Linewidth

The time-averaged 3-dB width of the optical spectrum, expressed in Hertz.

Conditions: temperature within operating temperature range, coherence control on, power set to specified value.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 41

Specifications Definition of Terms

Measurement with heterodyning technique: the output of the laser under test is mixed with another laser of the same type on a wide bandwidth photodetector. The electrical noise spectrum of the photodetector current is measured with an Agilent Lightwave Signal Analyzer, and the linewidth is calculated from the heterodyne spectrum (Lightwave signal analyzer settings: resolution bandwidth 1 MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan).

Linewidth

The 3-dB width of the optical spectrum, expressed in Hertz.

Conditions: temperature within operating temperature range, coherence control off, power set to maximum flat power (maximum attainable power within given wavelength range).

Measurement with self-heterodyning technique: the output of the laser under test is sent through a Mach-Zehnder interferometer in which the length difference of the two arms is longer than the coherence length of the laser. The electrical noise spectrum of the photodetector current is measured with an Agilent Lightwave Signal Analyzer, and the linewidth is calculated from the heterodyne spectrum (Lightwave signal analyzer settings: resolution bandwidth 1 MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan).

Minimum Output Power

The minimum output power for which the specifications apply.

Mode-Hop Free Tuning Range

The tuning range for which no abrupt wavelength change occurs during fine wavelength stepping. Abrupt change is defined as change of more than 25 pm.

Conditions: within specified wavelength range, at specified temperature range and output power. Tuning from outside into the mode-hop free tuning range is not allowed.

Modulation Extinction Ratio

The ratio of total power in on-state to total power in off-state, expressed in dB.

Conditions: Internal or external modulation, tunable laser at highest power setting.

42 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Definition of Terms Specifications

Measurement with optical spectrum analyzer. Tunable laser switched on and off.

Modulation Frequency Range

The range of frequencies for which the modulation index is above − 3 dB of the highest modulation index. In this context, modulation index is defined as the AC power amplitude (peak-to-peak) divided by the average power.

Output Power

The achievable output power for the specified TLS tuning range.

Conditions: temperature within operating temperature range.

Measurement with power meter at the end of a single-mode fiber

patchcord.

Output Isolation

The insertion loss of the built-in isolator in the backward direction.

Measurement: Cannot be measured from the outside. This characteristic is based on known isolator characteristics.

Peak Power

The highest optical power within specified wavelength range.

Polarization Extinction Ratio

The ratio of optical power in the slow axis of the polarizationmaintaining fiber to optical power in the fast axis within a specified wavelength range.

Conditions: only applicable for TLS with polarization maintaining fiber with the TE mode in slow axis and oriented in line with connector key, at constant power level.

Measurement with a polarization analyzer at the end of a polarizationmaintaining patchcord, by sweeping the wavelength, thereby creating circular traces on the Poincaré sphere, then calculating the polarization extinction ratio from the circle diameters.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 43

Specifications Definition of Terms

Power Flatness Over Modulation

When changing the wavelength and modulation frequency, and measuring the differences between actual and displayed power levels (in dB), the power flatness is ± half the span between the maximum and the minimum value of all differences.

Conditions: uninterrupted line voltage, constant power setting, temperature within ±2 K, external modulation ON.

Measurement with optical power meter.

Power Flatness Versus Wavelength

When changing the wavelength at constant power setting and recording the differences between actual and displayed power levels, the power flatness is ± half the span (in dB) between the maximum and the minimum of the measured power levels.

Conditions: uninterrupted TLS output power, constant power setting, temperature within ±1K.

Measurement with optical power meter.

Power Linearity

When changing the power level and measuring the differences (in dB) between actual and displayed power levels, the power linearity is ± half the span (in dB) between the maximum and the minimum value of all differences.

Conditions: power levels from within specified output power range, uninterrupted TLS output power, at fixed wavelength settings and stable temperature.

Measurement with optical power meter.

Power Repeatability

The random uncertainty in reproducing the power level after changing and re-setting the power level. The power repeatability is ± half the span (in dB) between the highest and lowest actual power.

Conditions: uninterrupted TLS output power, constant wavelength, temperature within ±1 K, short time span.

Measurement with optical power meter.

NOTE The long-term power repeatability can be obtained by taken the power

repeatability and power stability into account.

44 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Definition of Terms Specifications

Power Stability

The change of the power level during given time span, expressed as ± half the span (in dB) between the highest and lowest actual power.

Conditions: uninterrupted TLS output power, constant wavelength and power level settings, temperature within ±1 K, time span as specified.

Measurement with optical power meter.

Relative Intensity Noise (RIN)

The square of the (spectrally resolved) RMS optical power amplitude divided by the measurement bandwidth and the square of the average optical power, expressed in dB/Hz.

Conditions: at specified output power, coherence control off, temperature within operating temperature range, frequency range 0.1 to 6 GHz.

Measurement with Agilent Lightwave Signal Analyzer.

Relative Wavelength Accuracy

When randomly changing the wavelength and measuring the differences between the actual and displayed wavelengths, the relative wavelength accuracy is ± half the span between the maximum and the minimum value of all differences.

Conditions: uninterrupted TLS output power, constant power level, temperature within operating temperature range, observation time 10 minutes maximum (constant temperature), coherence control off, measured at high power output.

Measurement with wavelength meter. Averaging time given by wavelength meter, ≥1 s.

NOTE The relative wavelength accuracy of Output 1, the Low SSE Output, of

the Agilent 81640A/80A Tunable Laser modules is the same as the relative wavelength accuracy of Output 2, the High Power Output (guaranteed by design).

Return Loss

The ratio of optical power incident to the TLS outpu t port, at the TLS's own wavelength, to the power reflected from the TLS output port.

Conditions: TLS disabled.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 45

Specifications Definition of Terms

Sidemode Suppression Ratio

The ratio of average signal power to the optical power of the highest sidemode within a distance from 0.1 to 6 GHz to the signal's optical frequency, expressed in dB.

Conditions: at a specified output power and wavelength range, temperature within operating temperature range, coherence control off.

Measurement with the Agilent Lightwave Signal Analyzer, by analyzing the heterodyning between the main signal and the highest sidemode.

Signal-to-Source Spontaneous Emission (SSE) Ratio

The ratio of signal power to maximum spontaneous e mission power in 1 nanometer bandwidth within a ±3 nm window around the signal wavelength, where ±1 nm around the signal wavelength are excluded, at the specified output power, expressed in dB/nm.

Conditions: output power set to specified values, at temperatures within operating temperature range, coherence control off.

Measurement with optical spectrum analyzer (OSA) at 0.5 nm resolution bandwidth (to address the possibility of higher SSE within a narrower bandwidth), then extrapolated to 1 nm bandwidth. On low-SSE output (if applicable), with fiber Bragg grating inserted between the TLS and the OSA in order to suppress the signal, thereby enhancing the dynamic range of the OSA.

NOTE The specified signal-to-SSE ratio is also applicable to output powers

higher than the specified values.

Signal-to-Total-Source Spontaneous Emission

The ratio of signal power to total spontaneous emission power, at the specified achievable output power, expressed in dB.

Conditions: output power set to specified values, at temperatures within operating temperature range, coherence control off.

Measurement with optical spectrum analyzer, by integrating the source spontaneous emission and excluding the remnant signal. On low-SSE output (if applicable), with fiber Bragg grating inserted between the TLS and the OSA in order to suppress the signal, thereby enhancing the dynamic range of the OSA.

46 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Definition of Terms Specifications

NOTE The specified signal-to-total-SSE ratio is also applicable to output

powers higher than the specified values.

Wavelength Range

The range of wavelengths for which the specifications apply.

Wavelength Repeatability

The random uncertainty in reproducing a wavelength after detuning and re-setting the wavelength. The wavelength repeatability is ± half the span between the maximum and the minimum value of all actual values of this wavelengths.

Conditions: uninterrupted TLS output power, constant power level, temperature within operating temperature range, coherence control off, short time span.

Measurement wit h w a veleng th m eter a t high power o u t put. Ave r a ging time given by wavelength meter, ≥1 s.

NOTE The wavelength repeatability of Output 1, the Low SSE Output, of the

Agile nt 81680A/40A Tunable Laser modules is the same as th e relative wavelength accuracy of Output 2, the High Power Output (guaranteed by design).

NOTE The long-term wavelength repeatability can be obtained by taken the

wavelength repeatability and wavelength stability into account.

Wavelength Resolution

The smallest possible displayed wavelength increment/decrement.

Wavelength Stability

The change of wavelength during given time span, expressed as ± half the span between the maximum and the minimum of all actual wavelengths.

Conditions: uninterrupted TLS output power, constant wavelength and power level settings, coherence control off, temperature within ±1 K, time span as specified.

Measurement with wavelength meter. Averaging time given by wavelength meter, ≥1 s.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 47

Specifications Tunable Laser Module Specifications

Tunable Laser Module Specifications

Agilent 81480A

Output 1

(Low SSE)

Wavelength range 1370 nm to 1480 nm

Wavelength resolution 0.1 pm, 15 MHz at 1450 nm

Mode-hop free tuning range

Absolute wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

Wavelength stability (typ., 24 hours at constant temperature)

Tuning speed (typ. for a 1/10/100 nm step) 400 ms/ 600 ms/ 2.8 s

Linewidth (typ.), coherence control off 100 kHz

Effective linewidth (typ.), coherence ctrl. on> 50 MHz (1420 - 1470 nm), at maximum flat output power)

Output power (continuous power during tuning)

1, 2, 9

2, 9

full wavelength range

±0.01 nm

±5 pm, typ. ±2 pm

±1 pm, typ. ±0.5 pm

< ±1 pm

> -4.5 dBm peak typ

> -7 dBm (1420 – 1470 nm)

> +5.5 dBm peak typ

> +3 dBm (1420 - 1470 nm)

Agilent 81480A

Output 2

(High Power)

Minimum output power

Power stability

Power repeatability (typ.)

Power linearity

3, 9

> -13 dBm (1370 – 1480 nm)[9]

-13 dBm -3 dBm

±0.01 dB, 1 hour (1420nm-1480nm)

typ. ±0.01 dB, 1 hour (1370nm-1420nm) [9]

typ. ±0.03 dB, 24 hours

±0.01 dB

±0.1 dB (1420nm-1480nm)

typ. ±0.1dB (1370nm-1420nm) [9]

> -3 dBm (1370 - 1480 nm)[9]

(-60 dBm in attenuation mode)

±0.3 dB (1420nm-1480nm)

typ. ±0.3 dB (1370nm-1420nm) [9]

48 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Tunable Laser Module Specifications Specifications

Power flatness versus wavelength

Side-mode suppression ratio (typ.)

Signal-to-Source Spontaneous Emission

5, 8

Ratio

Signal-to-Total-Source Spontaneous Emission ratio

6, 8

3, 9

4, 8, 9

±0.2 dB, typ. ±0.1 dB

(1420-1480nm)

±0.2 dB typ (1370nm-1420nm)

> 40 dBc (1380 - 1480 nm)

> 61 dB/nm [7]

(1420 – 1470 nm)

> 55 dB/nm [7] [9] (typ., 1370 – 1480 nm)

> 58 dB

(1420 – 1470 nm) [7]

±0.3 dB, typ. ±0.2 dB

(1420nm-1480nm)

±0.3 dB typ (1370nm-1420nm)

> 40 dB/ nm

(1420 – 1470 nm)

> 35 dB/ nm

(1370 – 1480 nm)

> 28 dB

(typ., 1420 - 1470 nm )

> 53 dB

(typ., 1370 - 1480 nm) [7] [9]

Relative intensity noise (RIN, typ.)

-145 dB/Hz (1420 - 1470 nm)

1. Valid for one month and within a ±5 K temperature range after automatic wavelength zeroing.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Applies to the selected output.

4. Measured by heterodyning method.

5. Measured with optical spectrum analyzer at 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

7. Measured with fiber Bragg grating to suppress the signal.

8. Output power as specified per wavelength range and output port.

9. Wavelength must not be equal to any water absorption line

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 49

Specifications Tunable Laser Module Specifications

Agilent 81680A and Agilent 81640A

Agilent 81680A

Output 1

(Low SSE)

Agilent 81680A

Output 2

(High Power)

Agilent 81640A

Output 1

(Low SSE)

Agilent 81640A

Output 2

(High Power)

Wavelength range 1460 nm to 1580 nm 1510 nm to 1640 nm

Wavelength resolution 0.1 pm, 12.5 MHz at 1550 nm

Mode hop free tuning range 1460 nm to 1580 nm 1510 nm to 1640 nm

Absolute

wavelength accuracy

Relative wavelength accuracy

Wavelength repeatability

Wavelength stability (typ., 24 hours at constant temperature)

Tuning speed

1, 2

± 0.01 nm ± 0.015 nm

± 5pm, typ. ± 2pm ± 7pm, typ. ± 3pm

± 1 pm, typ. ± 0.5 pm

≤± 1 pm

400 ms/600 ms/2.8 s

(typ. for a 1/10/100 nm step)

Linewidth (typ.), coherence control

100 kHz

off.

Effective Linewidth (typ.), coherence control on

Output power

>50 MHz (1480 to 1580 nm, at maximum

flat output power)

≥ −4 dBm peak typ.

≥ 6 dBm peak typ.

>50 MHz (1520 to 1620 nm, at maximum

flat output power)

≥ −5 dBm peak typ.

≥ 4 dBm peak typ.

(continuous power during tuning)

Minimum output power

Power stability

Power repeatability (typ.)

Power linearity

Power flatness versus wavelength

Side-mode Suppression ratio (typ.)

4,8

(1520-1570 nm)

(1480-1580 nm)

(1460-1580 nm)

≥ −6 dBm

≥ −10 dBm

≥ −13 dBm

−13 dBm −3 dBm

± 0.1 dB ± 0.3 dB ± 0.1 dB ± 0.3 dB

± 0.2 dB,

typ.

± 0.1 dB

≥ 40 dBc

(1480-1580 nm)

≥ 5 dBm

(1520-1570 nm)

≥ 1 dBm

(1480-1580 nm)

≥ −3 dBm

(1460-1580 nm)

(−60 dBm in atten-

uation mode)

± 0.01 dB, 1 hour.

typ.

± 0.03 dB, 24 hours

± 0.01 dB

± 0.3 dB,

typ.

± 0.15 dB

≥ −7 dBm

(1530-1610 nm)

≥ −9 dBm

(1520-1620 nm)

≥ −13 dBm

(1510-1640 nm)

−13 dBm −5 dBm (−60 dBm in atten-

uation mode)

± 0.2 dB,

typ.

± 0.1 dB

typ.

≥ 40 dBc

(1530-1610 nm)

≥ 2 dBm

≥ 0 dBm

≥ −5 dBm

± 0.3 dB,

± 0.15 dB

50 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Tunable Laser Module Specifications Specifications

Signal-to-Source Spontaneous Emission Ratio

Signal-to-Total-Source Spontaneous Emission

Relative Intensity noise (RIN, typ.)

1. Valid for one month and within a

5,8

Ratio

6,8

±5 K temperature range after wavelength zeroing.

Agilent 81680A

Output 1

(Low SSE)

≥ 63 dB/nm

(1520-1570 nm)

≥ 58 dB/nm

1480-1580 nm)

≥ 53 dB/nm

(typ.,

1460-1580 nm)

≥ 60 dB

(1520-1570 nm)

(typ., 1480-1580 nm)

≥ 50 dB

− 145 dB/Hz (1480-1580 nm) − 145 dB/Hz (1530-1610 nm)

Agilent 81680A

Output 2

(High Power)

≥ 45 dB/nm

(1520-1570 nm)

≥ 40 dB/nm

(1480-1580 nm)

≥ 35 dB/nm

(1460-1580 nm)

≥ 30 dB

(typ., 1520-1570

nm)

Agilent 81640A

≥ 60 dB/nm

(1530-1610 nm)

≥ 55 dB/nm

1520-1620 nm)

≥ 50 dB/nm

(typ., 1510-1640 nm)

(1530-1610 nm)

(typ., 1510-1640 nm)

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Applies to the selected output.

4. Measured by heterodyning method.

5. Measured with optical spectrum analyzer at 1 nm resolution bandwidth.

6. Measured with optical spectrum analyzer.

Output 1

(Low SSE)

≥ 55 dB

≥ 45 dB

(typ.,

Agilent 81640A

Output 2

(High Power)

≥ 45 dB/nm

(1530-1610 nm)

≥ 40 dB/nm

(1520-1620 nm)

≥ 35 dB/nm

(1510-1640 nm)

≥ 27 dB

(typ., 1530-1610

nm)

7. Measured with Fiber Bragg Grating to supress the signal.

8. Output power as specified per wavelength range and ouput port.

9. Warm up time: 1 hour

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 51

Specifications Tunable Laser Module Specifications

Agilent 81682A, Agilent 81642A

and Agilent 81689A

Agilent 81682A Agilent 81642A Agilent 81689A

Wavelength range 1460 nm to 1580 nm 1510 nm to 1640 nm 1525 nm to 1575 nm

Wavelength resolution 0.1 pm, 12.5 MHz at

1550 nm

0.1 pm, 12.5 MHz at 1550 nm

Mode hop-free tuning range 1460 nm to 1580 nm full wavelength range

Absolute wavelength accuracy

± 0.01 nm

1, 2

Relative wavelength accuracy ± 5pm, typ. ± 2pm

Wavelength repeatability

Wavelength stability (typ, over 24 hours

± 1pm, typ. ± 0.5 pm

< ± 1pm

1, 2

± 0.015 nm

± 7pm, typ. ± 3pm

± 1pm, typ. ± 0.5 pm

< ± 1pm

1, 2

at constant temperature)

Tuning speed 400 ms/600 ms/2.8 s

(typ. for a 1/10/100 nm

step)

Linewidth (typ.) 100 kHz,

coherence control off

Effective Linewidth (typ.), coherence control on

> 50 MHz (1480 -

1580 nm, at maximum flat

output power)

Output power

(continuous power during tuning)

≥ 8dBm peak typ.

≥ 6 dBm (1520 - 1570 nm)

≥ 2 dBm (1480 - 1580 nm)

400 ms/600 ms/2.8 s

(typ. for a 1/10/100 nm

step)

100 kHz,

coherence control off

> 50 MHz (1520 -

1620 nm, at maximum flat

output power)

≥ 7 dBm peak typ.

≥ 6 dBm (1560 - 1610 nm)

≥ 4 dBm (1530 - 1610 nm)

0.01 nm, 1.25 GHz at 1550 nm

± 0.3 nm, typ.

± 0.3 nm

± 0.05 nm

< ± 0.02 nm

< 10 sec/ 50 nm (typ.)

20 MHz

- -

≥ 6dBm (1525-1575nm)

≥ −3 dBm (1460-1580 nm)

≥ 2 dBm (1520 - 1620 nm)

≥ −3 dBm (1510-1640 nm)

/with option #003 reduce by 1.5 dB

Minimum output power

/with option #003

−3dBm

−4.5 dBm (−60 dBm in

attenuation mode)

Power stability

± 0.01 dB, 1 hour

typ. ±0.03 dB, 24 hours

reduce by 1.5 dB

−3dBm

−4.5 dBm (−60 dBm in

attenuation mode)

± 0.01 dB, 1 hour

typ. ±0.03 dB, 24 hours

Power repeatability (typ.) ± 0.01 dB ± 0.01 dB ± 0.02 dB

Power linearity (typ.)

/with option #003

Power flatness versus wavelength

/with option #003

± 0.1 dB

± 0.2 dB

± 0.2 dB, typ. ± 0.1 dB

± 0.3 dB, typ. ±0.2 dB

± 0.3 dB

± 0.3 dB, typ. ± 0.15 dB

± 0.3 dB

- -

−3dBm

± 0.03 dB, 1 hour

± 0.06 dB, 24 hours

± 0.1 dB

± 0.3 dB

52 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Tunable Laser Module Specifications Specifications

Agilent 81682A Agilent 81642A Agilent 81689A

Side-mode Suppression ratio (typ.) ≥ 40 dBc

(1480 - 1580 nm)

Signal-to-Source Spontaneous Emission Ratio

≥ 45 dB/nm

(1520 - 1570 nm)

≥ 40 dB/nm

(1480 - 1580 nm)

≥ 35 dB/nm

(1460 - 1580 nm)

Signal-to-Total-Source Spontaneous Emission Ratio

Relative Intensity noise (RIN, typ.)

≥ 30 dB

(1520 - 1570 nm)

−145 dB/Hz

(1460 - 1580 nm)

5,8

6,8

7,8

≥ 40 dBc

(1530 - 1610 nm)

≥ 45 dB/nm

(1530 - 1610 nm)

≥ 40 dB/nm

(1520 - 1620 nm)

≥ 35 dB/nm

(1510 - 1640 nm)

≥ 27 dB

(1530 - 1610 nm)

−145 dB/Hz

(1530 - 1610 nm)

> 40 dBc (1525 - 1575 nm

5,8

6,8

7,8

at 0 dBm)

≥ 39 dB/nm

(1525 - 1575 nm at

6dBm)

< −140 dB/Hz

(100 MHz - 2.5 GHz)

- -

Dimensions - - - - 75 mm H, 32 mm W, 335

mm D

(2.8” × 1.3” × 13.2”

Weight - - - - 1 kg

1. Valid for one month and within a

±5 K temperature range after automatic wavelength zeroing.

2. At CW operation. Measured with wavelength meter based on wavelength in vacuum.

3. Measured by heterodyning method with 20 ms sweep time, 50 MHz span, 1 MHz resolution.

4. Option #003: built-in optical attenuator.

5. Measured by heterodyning method.

6. Measured with optical spectrum analyzer at 1 nm resolution bandwidth.

7. Measured with optical spectrum analyzer.

8. Output power as specified per wavelength range.

9. 500 ms after changing power.

10. Warm up time: 1 hour

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 53

Specifications Supplementary Performance Characteristics

Supplementary Performance Characteristics

Operating Modes

Internal Digital Modulation

50% duty cycle, 200 Hz to 300 kHz. Modulation output: TTL reference signal.

Agilent 81480A, Agilent 81680A/40A/82/42A: displayed wavelength

represents average wavelength while digital modulation is active.

External Digital Modulation

> 45% duty cycle, fall time < 300 ns, 200 Hz to 1 MHz. Modulation input: TTL signal.

External Analog Modulation

≤ 15% modulation depth, 5 kHz to 20 MHz. Modulation input: 5 Vp-p.

External Wavelength Locking (Agilent 81480A, Agilent 81680A/40A/82A/42A)

> ±70 pm at 10 Hz

±7 pm at 100 Hz

> Modulation input:

±5 V

Coherence Control (Agilent 81480A, Agilent 81680A/40A/82A/42A)

For measurements on components with 2-meter long patchcords and connectors with 14 dB return loss, the effective linewidth results in a typical power stability of < the test setup.

±0.025 dB over 1 minute by drastically reducing interference effects in

54 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Supplementary Performance Characteristics Specifications

Continuous Sweep (Agilent 81680A/40A/82A/42A)

Tuning velocity adjustable to: 40 nm/s, 5 nm/s, 0.5 nm/s.

Mode-hop free span:

• Agilent 81480A:

1420 - 1470 nm at flat output power ≥ 0 dBm

• Agilent 81680A/82A:

1520 - 1570 nm at flat output power ≥ 3 dBm

• Agilent 81640A:

Any 50 nm within 1520 - 1620 nm at flat output power ≥ 0 dBm

• Agilent 81642A:

Any 50 nm within 1520 - 1620 nm at flat output power ≥ 2 dBm

Ambient temperature within +20°C and +30°C.

Stepped Mode (Agilent 81680A/40A/82A/42A)

Full instrument performance (Agilent 81680A/40A/82A/42A).

Please note that the laser is turned off for 3 µs after each wavelength tuning in the range 1620-1640nm (Agilent 81640A only).

General

Output Isolation (typ.):

50 dB (for Agilent 81689A: 38 dB)

Return loss (typ.):

60 dB (options 022, 072); 40 dB (options 021, 071).

Polarization Maintaining Fiber (Options 071, 072):

Fiber type: Panda. Orientation: TE mode in slow axis, in line with connector key. Extinction Ratio: 16 dB typ.

Laser Class:

Class IIIb according to FDA 21 CFR 1040.10, Class 3A according to IEC 825 - 1; 1993.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 55

Specifications Supplementary Performance Characteristics

Recalibration Period:

2 years.

Warm-up Time:

< 20 min (< 40 min for Agilent 81689A), immediate operation after boot-up.

Environmental

Storage Temperature:

−40°C to +70°C.

Operating Temperature:

+10°C to +35°C (+15°C to +35°C for Agilent 81689A).

Humidity:

< 80% R. H. at +10°C to +35°C (+15×°C to +35°C for Agilent 81689A). Specifications are valid in non-condensing conditions.

56 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Tests

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 57

Performance Tests

The procedures in this section tests the optical performance of the

instrument. The complete specifications to which the Agilent 81480A,

Agilent 81680A, Agilent 81640A, Agilent 81682A, Agilent 81642A and

Agilent 81689A are tested are given in “Specifications” on page 39. All

tests can be performed without access to the interior of the

instrument. The performance tests refer specifically to tests using the

Diamond HMS-10/Agilent connector.

58 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Required Test Equipment Performance Tests

Required Test Equipment

The equipment required for the Performance Test is listed in Table Table 4. Any equipment which satisfies the critical specifications of the equipment given in Table Table 4, may be substituted for the recommended models.

Table 4 Equipment Required

Instrument Description of Instrument/Accessory #021, #071 #022, #072

Agilent 86142B

Agilent 8164A Lightwave Measurement System 1 1

WA-1500 Burleigh Wavemeter 1 1

8153A

81533B

81532A

81525A

N/A

2, 3

Standard Optical Head 1 1

Agilent 81000SA DIN 47256/4108 Connector Adapter 1 1

Agilent 81000SI DIN 47256/4108 Connector Interface 2

Agilent 81000FI FC/PC Connector Interface 1

Agilent 81101PC Diamond HMS-10/Agilent FC/PC Patchcord 1

Agilent 81113PC Diamond HMS-10/Agilent FC/Super PC Patchcord 1 1

Agilent 81113SC Diamond HMS-10/Agilent DIN 47256/4108 Patchcord 1

Optical Spectrum Analyzer 1 1

Lightwave Multimeter 1 1

Optical Head Interface Module 1 1

Power Sensor Module 1 1

Fiber Bragg Grating 1 1

You can use the HP 71452B or HP 71450A #100 instead of the

Agilent 86142B.

You can use the HP 81524A plus HP 81001FF instead of the 81525A

You can use the 8163A, 81618A, 81625A and 81634A instead of the

8153A, 81533B, 81525A, and 81532A.

Approximately 1520nm for the 81640A, 81642A, 81680A, 81682A;

Approximately 1407nm for the 81480A

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 59

Performance Tests Required Test Equipment

Tes t Re co rd

Results of the performance test may be tabulated in the Test Record provided at the end of the test procedures. It is recomm ended that you fill out the Test Record and refer to it while doing the test. Since the test limits and setup information are printed on the Test Record for easy reference, the record can also be used as an abbreviated test procedure (if you are already familiar with the test procedures). The Test Record can also be used as a permanent record and may be reproduced without written permission from Agilent Technologies.

Test Failure

Always ensure that you use the correct cables and adapters, and that all connectors are undamaged and extremely clean.

If the Agilent 81480A or Agilent 81680A/40A/82A/42A/89A Tunable Laser module fails any performance test, return the instrument to the nearest Agilent Technologies Sales/Service Office for repair.

Instrument Specification

Specifications are the performance characteristics of the instrument which are certified. These specifications, listed in “Specifications” on page 39, are the performance standards or limits against which the Agilent 81480A and Agilent 81680A/40A/82A/42A/89A Tunable Laser modules can be tested.

The specifications also list some supplemental characteristics of the Agilent 81480A and Agilent 81680A/40A/82A/42A/89A Tunable Laser modules. Supplemental characteristics should be considered as additional information.

Any changes in the specifications due to manufacturing changes, design, or traceability to the National Institute of Standards and Technology (NIST), will be covered in a manual change su pplement, or revised manual. Such specifications supersede any that were previously published.

60 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Performance Test Instructions

NOTE • Make sure that all fiber connectors are clean.

• Turn the instruments on, enable the laser and allow the

instruments to warm up.

• Ensure that the Device Under Test (DUT) and all the test

equipment is held within the environmental specifications given

in “Specifications” on page 39

General Test Setup

Insert your Tunable Laser module into the Agilent 8164A Lightwave Measurement System. Insert an Agilent 81480A, Agilent 81680A, Agilent 81640A, Agilent 81682A, or Agilent 81642A Tunable Laser module from the rear. Insert an Agilent 81689A Tunable Laser module from the front into slot 1 of the Agilent 8164A Lightw ave Measurement System.

Wavelength Tests

NOTE When performing wavelength tests, zero the Tunable Laser first.

Move to Channel 0, press [Menu], select <λ Zeroing>.

Zeroing takes approximately 2 minutes.

Connect the Tunable Laser module to the Wavelength Meter as shown in Figure 17.

If you use the Agilent 81480A, Agilent 81680A or Agilent 81640A Tunable Laser module, connect the Output 2, the high power output.

Agilent 8164A Lightwave Measurement System

Tunable Laser

For #021, #071: use 81000AI and 81101PC For #022, #072: use 81000SI and 81113PC

Figure 17 Test Setup for Wavelength Tests

Straight

Connector

Wavelength Meter

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 61

Performance Tests Performance Test Instructions

General Settings of Wavelength Meters for all Wavelength Tests

Set the Burleigh WA-150 to the following settings:

• Set Display to Wavelength.

• Set Medium to Vacuum.

• Set Resolution to Auto.

• Set Averaging to On.

• Set Input Attenuator to Auto.

Wavelength Accuracy

The steps below explain how to calculate the Relative Wavelength Accuracy, Absolute Wavelength Accuracy, and the Mode Hop Free Tuning Result.

Relative Wavelength Accuracy

1 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

2 Set the menu parameters to the values shown in Table Table 5.

Table 5 Tunable Laser Channel Settings

Tunable Laser Channel Menu Parame-

ters

3 If you use the Agilent 81480A, Agilent 81680A Tunable Laser

module or the Agilent 81640A Tunable Laser module:

Connect the fiber output to Output 2, the High Power output.

Set <Optical Output> to <High Power (2)>.

4 Set the wavelength and power of your Tunable Laser module to the

values given in Table Table 6.

Values

62 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Table 6 Initial Wavelength and Power Settings for Relative Wavelength Accuracy Tests

Module Wavelength [λ] Power [P]

Agilent 81480A 1370.200 nm −3.00 dBm

Agilent 81680A 1460.000 nm −3.00 dBm

Agilent 81640A 1510.000 nm −3.00d Bm

Agilent 81682A 1460.000 nm −3.00 dBm

Agilent 81682A (#003) 1460.000 nm −4.50 dBm

Agilent 81642A 1510.000 nm −3.00 dBm

Agilent 81642A (#003) 1510.000 nm −4.50 dBm

Agilent 81689A 1525.000 nm −3.00 dBm

5 Press the key beside the laser output to switch on the laser output.

6 Wait until the wavelength meter has settled, then, note the

wavelength displayed on the wavelength meter in the test record.

7 Increase the wavelength setting of Tunable Laser module by the

steps shown in the test record.

8 Repeat steps 6 and 7 up to the maximum wavelength values shown

in Table Table 7.

Table 7 Maximum Wavelength for Relative Wavelength Accuracy Tests

Tunable Laser Module Maximum Wavelength Value

Agilent 81480A 1480 nm

Agilent 81680A 1580 nm

Agilent 81640A 1640 nm

Agilent 81682A 1580 nm

Agilent 81642A 1640 nm

Agilent 81689A 1575 nm

9 Repeat steps 4 through 8 another 4 times.

10 From each repetition of the measurements, pick the maximum and

minimum deviations, and note these values in the test record.

11 Determine the Relative Wavelength Accuracy Summary of all

repetitions:

a Pick the largest Maximum Deviation, and note it as the Largest

Maximum Deviation in the test record.

b P i c k t h e sm all e s t Mi n imu m De v i a ti o n , an d no t e i t a s t he Sm all e st

Minimum Deviation in the test record.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 63

Performance Tests Performance Test Instructions

NOTE The largest Maximum Deviation is the largest positive value and the

smallest Minimum Deviation is the largest negative value (largest deviation above and below zero respectively).

12 Determine the Relative Wavelength Accuracy Result:

Subtract the Smallest Minimum Deviation from the Largest

Maximum Deviation. Record this value as the Relative Wavelength

Accuracy Result.

Absolute Wavelength Accuracy

13 From the measurements taken in the Relative Wavelength Accuracy

test, pick the largest absolute value from either the Largest

Maximum Deviation or the Smallest Minimum Deviation taken in

step 12 and note this value as Absolute Wavelength Accuracy.

Mode Hop Free Tuning

NOTE This section does not apply for Agilent 81689A Tunable Laser module.

14 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

15 Set the menu parameters to the values shown in Table Table 5.

16 If you are using the Agilent 81480A, Agilent 81680A, or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the High Power output.

Set <Optical Output> to <High Power (2)>.

17 Set the wavelength and power of your Tunable Laser module to the

values given in Table Table 8.

Table 8 Initial Wavelength and Power Settings for Relative Wavelength Accuracy Tests

Module Wavelen gth [λ] Power [P]

Agilent 81480A 1415.000 nm 0.00 dBm

Agilent 81680A 1460.000 nm −3.00 dBm

Agilent 81640A 1510.000 nm −3.00d Bm

Agilent 81682A 1460.000 nm −3.00 dBm

Agilent 81682A (#003) 1460.000 nm −4.50 dBm

Agilent 81642A 1510.000 nm −3.00 dBm

Agilent 81642A (#003) 1510.000 nm −4.50 dBm

Agilent 81689A 1525.000 nm −3.00 dBm

64 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

18 Press the key beside the laser output to switch on the laser output.

19 Then perform steps 4 through 8 once.

20 Note the wavelength displayed by the wavelength meter in the test

record.

21 Increase wavelength setting on Tunable Laser by the steps shown in

the test record.

22 Repeat steps 6 and 7 up to the maximum wavelength values shown

in Table Table 7.

23 Pick the maximum and minimum deviations, and note these values

in the test record.

24 Subtract the Minimum Deviation from the Maximum Deviation.

Record this value as the Mode Hop Free Tuning Result.

25 You do not need to repeat the Mode Hop Free Tuning test.

Wavelength Repeatability

1 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

2 Set the menu parameters to the values shown in Table Table 5.

3 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the High Power output.

Set < Optical Output> to <High Power (2)>.

4 Set th e wavelength and power for each Tunable Laser modu le to the

values given in Table Table 9.

Table 9 Reference Wavelength and Power Settings for Wavelength Repeatability Tests

Module Wavelength [λ] Power [P]

Agilent 81480A 1370.200 nm −3.00 dBm

Agilent 81680A 1460.000 nm −3.00d Bm

Agilent 81640A 1510.000 nm −3.00 dBm

Agilent 81682A 1460.000 nm −3.00 dBm

Agilent 81682A #003 1460.000 nm −4.50 dBm

Agilent 81642A 1510.000 nm −3.00 dBm

Agilent 81642A #003 1510.000 nm −4.50 dBm

Agilent 81689A 1525.000 nm −3.00 dBm

5 Press the key beside the laser output to switch on the laser output.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 65

Performance Tests Performance Test Instructions

6 Wait until the wavelength meter has settled. Then measure the

wavelength with the wavelength meter and note the result in test

record as the reference wavelength, "REF".

7 Set the wavelength of your Tunable Laser module to any wavelength

in its range (in the test record, this is given in column “from

wavelength”).

8 Set the wavelength of your Tunable Laser module back to the

Reference Wavelength and wait until the wavelength meter has

settled.

9 Measure the wavelength with the Wavelength Meter and note the

result in test record.

10 Repeat steps 7 through 9 with all wavelength settings given in the

“from wavelength” column of the test record.

11 From all wavelength measurem ents pick the largest measured value

and the smallest measured value.

12 Calculate the wavelength repeatability by subtracting the largest

measured value from the smallest measured value.

66 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Power Tests

Calibration of the Agilent 81001FF Attenuation Filter

NOTE When an HP 81524A Optical Head is used in conjunction with a

Agile nt 81001FF Attenuation Filter, it is absolutely necessary that you calibrate the Agilent 81001FF Attenuation Filter before starting the power tests in the following measurement setups; it is not sufficient to use calibration factors that are derived from an earlier setup.

1 Make sure all instruments have warmed up.

Agilent 8164A Lightwave Measurement System

Tunab le L ase r

For #021, #071: use 81000FI and 81113PC For #022, #072: use 81000SI and 81113SC

Figure 18 Calibration of the Agilent 81001FF Attenuation Filter, Reference Setup

2 Set the power meter installed in the HP 8153A to the following

values:

a Set range to 0 dBm; press Up or Down as required.

b Set T, the averaging time, to 500 ms.

c Agilent 81680A, 40A, 82A, 42A, & 89A:

Set λ, the wavelength, to 1550 nm.

Agilent 81480A:

Set λ, the wavelength, to 1450 nm.

Agilent 81000SA

Slanted

Connector

HP 81524A Optical Head

HP 8153A Lightwave Multimeter

HP 81533B

d Select dBm as the power units.

3 Move to the Tunable Laser channel of the Agilent 8164A.

Agilent 81680A, 40A, 82A, 42A, & 89A:

Set λ, the wavelength, to 1550 nm, and [P], the power, to 0 dBm..

For Agilent 81480A:

Set λ, the wavelength, to 1450 nm, and [P], the power, to 0 dBm.

4 Press the key beside the laser output to switch the laser on.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 67

Performance Tests Performance Test Instructions

5 Check if the display of HP 8153A reads 0 dBm ±2 dBm.

6 Select dB as the power units of the HP 8153A.

7 Press Disp−>Ref on the HP 8153A.

8 Attach the Agilent 81001FF Attenuation Filter to the Optical Head

as shown in Figure 19. Move the patchcord as little as possible,

keeping the laser activated.

Agilent 8164A Lightwave Measurement System

Tunable Laser

For #021, #071: use 81000FI and 81113PC For #022, #072: use 81000SI and 81113SC

Slanted

Connector

HP 8153A Lightwave Multimeter

Agilent 81001FF81000SA

HP 81524A Optical Head

HP 81533B

Figure 19 Test Setup for Calibrating the Agilent 81001FF Attenuation Filter

9 On the HP 8153A Lightwave Multimeter, move to the power

measurement channel where the HP 81533B is installed. Press

Parameter until CAL is displayed. Using the Modify keys, change

the CAL value until the display shows 0.00 dB.

10 For further measurements using this Attenuation Filter, you have to

set the calibration factor of the HP 8153A to this value to get the

absolute power reading.

68 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Maximum Output Power

Make sure the instruments have warmed up before starting the measurement.

NOTE • Absolute Power Accuracy is not specified.

• The result of the measurement below is greatly influenced by the

quality and the matching of the used interconnections.

1 Set up the equipment as shown in Table Figure 20.

Agilent 8164A Lightwave Measurement System

Tunable Laser

For #021, #071: use 81000FI and 81113PC For #022, #072: use 81000SI and 81113SC

81000SA

Slanted

Connector

HP 8153A Lightwave Multimeter

Figure 20 Test Setup for the Maximum Output Power Tests

2 Set the Power Meter to the following settings:

a Select automatic ranging; press Auto as required.

b Set T, the averaging time, to 500 ms.

c Select dBm as the power units.

3 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

HP 81525A Optical Head

HP 81533B

4 Set the menu parameters to the values shown in Table Table 5.

5 If you are using the Agilent 81480A, Agilent 81680A, or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 1, the Low SSE output,

remember to calibrate the Agilent 81001FF Attenuation Filter.

Set < Optical Output> to <Low SSE (1)>.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 69

Performance Tests Performance Test Instructions

6 Set the wavelength and power for each Tunable Laser m odule to th e

values given in Table Table 10.

Table 10 Reference Wavelength and Power Values for Maximum Output Power Tests

Module Wavelength [λ] Power [P]

Agilent 81480A - Output 1 1370.200 nm +0.00 dBm

Agilent 81480A - Output 2 1370.200 nm +10.00 dBm

Agilent 81680A - Output 1 1460.000 nm +0.00 dBm

Agilent 81680A - Output 2 1460.000 nm +10.00 dBm

Agilent 81640A - Output 1 1510.000 nm +0.00 dBm

Agilent 81640A - Output 2 1510.000 nm +10.00 dBm

Agilent 81682A 1460.000 nm +10.00 dBm

Agilent 81642A 1510.000 nm +10.00 dBm

Agilent 81689A 1525.000 nm +10.00 dBm

7 Press the key beside the laser output to switch on the laser output.

NOTE The laser output is limited to its maximum possible value at this

wavelength, the display will probably show ExP.

8 Set the wavelength of the HP 8153A to the same as your Tunable

Laser module, as given in Table Table 10.

9 Measure the output power with the HP 8153A and note the result

for this wavelength in the test record.

10 Increase the λ, output wavelength, of the Tunable Laser module to

the next value given in the test record.

11 Increase the wavelength of the HP 8153A to the same value.

12 Note the measured power in the test record for each wavelength

13 Repeat item 10 to item 12 for the full wavelength range

14 If you are using the Agilent 81680A, Agilent 81480A, or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the High Power output,

remember to calibrate the Agilent 81001FF Attenuation Filter and

set <Optical Output> to <High Power (2)>.

Then, perform steps 6 through 12 for the full wavelength range.

70 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Power Linearity

Power Linearity - Low Power Test

To measure the power linearity of the Low SSE output, Output 1, of the Agilent 81480A, Agilent 81680A, or the of the Agilent 81640A:

1 Set up the equipment as shown in Figure 21.

Agilent 8164A Lightwave Measurement System

Tunable Laser

For #021, #071: use 81000FI and 81113PC For #022, #072: use 81000SI and 81113SC

HP 8153A Lightwave Multimeter

HP 81532A Power Sensor

Figure 21 Test Setup for Low Power Linearity Tests

2 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table Table 5.

<Power Mode> does not apply.

4 Set th e wavelength and power for each Tunable Laser modu le to the

values given in Table Table 11.

Table 11 Wavelength and Power Settings for Low Power Linearity Tests

Module Wavelength [λ] Power [P]

Agilent 81480A - Output 1 1430.000 nm −7.00 dBm

Agilent 81680A - Output 1 1540.000 nm −6.00 dBm

Agilent 81640A - Output 1 1560.000 nm −7.00 dBm

Slanted

Connector

5 If you are using the Agilent 81680A, Agilent 81480A, or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 1, the Low SSE output.

Set < Optical Output> to <Low SSE (1)>.

6 Make sure the optical output is switched off.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 71

Performance Tests Performance Test Instructions

7 Set the HP 8153A to the following settings:

a Zero the HP 81532A; press Zero.

b Select automatic ranging; press Auto as required.

c Set T, the averaging time, to 500 ms.

d Select dB as the power units.

e Set the l, the wavelength, to the same as your Tunable Laser

module, as given in Table Table 11.

8 Press the key beside the laser output to switch on the laser output.

For the Agilent 81480A, Agilent 81680A and the Agilent 81640A,

press the key beside Output 1, the Low SSE output.

9 Record the power displayed by the HP 8153A.

10 Press Disp−>Ref on the HP 8153A.

11 Change the power setting of your Tunable Laser module to the next

value listed in the t est record and record the power displayed by the

HP 8153A again.

12 Record the power displayed by the HP 8153A as the "Measured

Relative Power from start".

13 Calculate the "Power Linearity at current setting as the sum of

"Measured Relative Power from start" and "Power Reduction from

start".

14 Repeat item 11 to item 13 for all power levels listed in the test

record.

15 Note the maximum and minimum values of the calculated Power

Linearity values for t he various settings and record t hese in the test

record.

16 Subtract the minimum values from the maximum values of the

Power Linearity for the various settings. Record these as the Total

Power Linearity for the various settings.

72 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Performance Test Instructions Performance Tests

Example (Agilent 81680A Output 1)

Power LinearityOutput 1

Power Setting

from start

Start = REF −6.0 dBm 0.00 dB + 0.00 dB = 0.00 dB

−7.0 dBm −1.02 dB + 1.00 dB = −0.02 dB

−8.0 dBm −1.92 dB + 2.00 dB = +0.08 dB

−9.0 dBm −3.02 dB + 3.00 dB = −0.02 dB

− 10.0 dBm −3.95 dB + 4.00 dB = +0.05 dB

− 11.0 dBm −5.07 dB + 5.00 dB = −0.07 dB

− 12.0 dBm −5.96 dB + 6.00 dB = +0.04 dB

− 13.0 dBm −7.05 dB + 7.00 dB = −0.05 dB

Maximum Power Linearity at current setting: +0.08 dB

Minimum Power Linearity at current setting: −0.07 dB

Total Power Linearity: (Max Power Linearity − Min Power Linearity) 0.15 dBpp

Measured Relative

Power from start

Power reduction

from start

Power Linearity

at current setting

Power Linearity - High Power Test

Follow the steps below to measure the power linearity (without using attenuation) of any one of the following:

• Output2, the High Power output, of the Agilent 81480A

• Output 2, the High Power output, of the Agilent 81680A

• Output 2, the High Power output, of the Agilent 81640A

• Agilent 81682A standard

• Agilent 81682A #003

• Agilent 81642A standard

• Agilent 81642A #003

• Agilent 81689A

1 Set up the equipment as shown in Figure 20 (remember to calibrate

the Agilent 81001FF Attenuation Filter if using 81524A).

2 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 73

Performance Tests Performance Test Instructions

3 Set the menu parameters to the values shown in Table Table 5.

For Agilent 81480A, Agilent 81680A, Agilent 81640A,

Agilent 81682A, and Agilent 81642A tunable lase modules:

Set <Power Mode> to <Manual Att>.

4 Set the wavelength and power for each Tunable Laser m odule to th e

values given in Table Table 12.

Table 12 Wavelength and Power Settings for High Power Linearity Tests without

Attenuation

Module Wavelength [λ] Power [P] Attenuation [Atten]

Agilent 81480A - Output 2 1430.000 nm +3.000 dBm 0.000 dB

Agilent 81680A - Output 2 1540.000 nm +5.000 dBm 0.000 dB

Agilent 81640A - Output 2 1560.000 nm +2.000 dBm 0.000 dB

Agilent 81682A 1540.000 nm +6.000 dBm Not applicable

Agilent 81682A #003 1540.000 nm +4.500d Bm 0.000 dB

Agilent 81642A 1580.000 nm +6.000 dBm Not applicable

Agilent 81642A #003 1580.000 nm +4.500 dBm 0.000 dB

Agilent 81689A 1540.000 nm +6.000 dBm Not applicable

NOTE • If you use the Agilent 81480A Output 2, or Agilent 81680A Output 2,

without attenuation, refer to the table “Power Linearity Output 2,

High Power Upper Power Levels” on page 120.

• If you use the Agilent 81640A Output 2 without attenuation, use the

table “Power Linearity Output 2, High Power Upper Power Levels”

on page 134.

• If you use the Agilent 81682A #003 without attenuation, use the

table “Power Linearity 81682A #003 Upper Power Levels” on

page 148.

• If you use the Agilent 81642A #003 without attenuation, use the

table “Power Linearity 81642A #003 Upper Power Levels” on

page 160.

5 Perform the steps 5 to 16 of the “Power Linearity - Low Power Test”

on page 71.

74 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Power Linearity - Test Using Attenuation

Follow the steps below to measure the power linearity (while using attenuation) of any one of the following:

• Output 2, the High Power output, of the Agilent 81480A

• Output 2, the High Power output, of the Agilent 81680A

• Output 2, the High Power output, of the Agilent 81640A

• Agilent 81682A #003

• Agilent 81642A #003

1 Set up the equipment as shown in Figure 21.

2 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table Table 5.

For Agilent 81480A, Agilent 81680A, Agilent 81640A,

Agilent 81642A#003 Agilent 81682A#003:

Set < Power Mode> to <Manual Att>.

4 Set th e wavelength and power for each Tunable Laser modu le to the

values given in Table Table 13.

Table 13 Wavelength and Power Settings for High Power Linearity Tests with

Attenuation

Module Wavelength [λ] Power [P] Attenuation [Atten]

Agilent 81480A - Output 2 1430.000 nm +0.000 dBm 0.000 dB

Agilent 81680A - Output 2 1540.000 nm +0.000 dBm 0.000 dB

Agilent 81640A - Output 2 1560.000 nm +0.000 dBm 0.000 dB

Agilent 81682A #003 1540.000 nm +0.000 dBm 0.000 dB

Agilent 81642A #003 1580.000 nm +0.000 dBm 0.000 dB

NOTE If you use the Agilent 81480A Output 2, Agilent 81680A Output 2, or

Agilent 81640A Output 2 with attenuation, use the table “Power Linearity Output 2, High Power by attenuator” on page 121 or “Power Linearity Output 2, High Power by Attenuator” on page 135 respectively.

If you use the Agilent 81682A #003 with attenuation, use the table “Power Linearity 81682A #003 by Attenuator” on page 149.

If you use the Agilent 81642A #003 with attenuation, use the table “Power Linearity 81642A #003 by Attenuator” on page 161.

5 Perform the steps 5 to 16 of the “Power Linearity - Low Power Test”

on page 71.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 75

Performance Tests Performance Test Instructions

Power Flatness over Wavelength

Power Flatness over Wavelength - Without Attenuation

Follow the steps below to measure the power flatness over wavelength (without using attenuation):

1 Set up the equipment as shown in Figure 21.

2 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table Table 5.

For Agilent 81480A, Agilent 81640A, Agilent 81680A,

Agilent 81642A#003, and Agilent 81682A#003:

Set <Power Mode> to <Manual Att>.

4 Set the wavelength and power for each Tunable Laser m odule to th e

values given in Table Table 14.

Table 14 Wavelength and Power Settings for Power Flatness over Wavelength Tests

without Attenuation

Module Wavelength [λ] Power [P] Attenuation [ATTEN]

Agilent 81480A - Output 1 1420.000 nm −13.000 dBm Not applicable

Agilent 81480A - Output 2 1420.000 nm −3.000 dBm 0.000 dB

Agilent 81680A - Output 1 1460.000 nm −13.000 dBm Not applicable

Agilent 81680A - Output 2 1460.000 nm −3.000 dBm 0.000 dB

Agilent 81640A - Output 1 1510.000 nm −13.00 dBm Not applicable

Agilent 81640A - Output 2 1510.000 nm −5.00 dBm 0.000 dB

Agilent 81682A 1460.000 nm −3.000 dBm Not applicable

Agilent 81682A #003 1460.000 nm −5.500 dBm 0.000 dB

Agilent 81642A 1510.000 nm Not applicable Not applicable

Agilent 81642A #003 1510.000 nm −4.500 dBm 0.000 dB

Agilent 81689A 1525.000 nm +2.000 dBm Not applicable

Agilent 81689A 1525.000 nm −3.000 dBm Not applicable

5 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 1, the Low SSE output.

Set <Optical Output> to <Low SSE (1)>.

6 Set the power meter channel of the HP 8153A to the following

settings:

a Set range to 0 dBm. Press Up or Down as required.

b Set T, the averaging time, to 500 ms.

76 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Performance Test Instructions Performance Tests

c Set the l, the wavelength, to the same as your Tunable Laser

module, as given in Table Table 14.

d Select dB as the power units.

7 Press the DISP->REF hardkey of the HP 8153A.

8 Increase the wavelength of the Tunable Laser module and of the

Power Meter to the next value listed in the test record.

9 Measure the output power. Note the result in the test record

10 Repeat steps 8 and 9 for the wavelength settings given in the test

record.

11 From the measurement results calculate the difference between the

maximum and minimum deviation from REF and note the result as

the Flatness.

12 If you use the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the High Power output.

Set < Optical Output> to <High Power (2)>.

13 Set wavelength and power as given in Table Table 14.

14 Repeat steps 6 to 11.

Power Flatness over Wavelength - Using Attenuation

Follow the steps below to measure the power flatness over wavelength (while using attenuation) of any one of the following:

• Agilent 81480A, Output 2, High Power

• Agilent 81680A, Output 2, High Power

• Agilent 81682A #003, Agilent 81642A #003

1 Set up the equipment as shown in Figure 21.

2 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table Table 5.

Set < Power Mode> to <Manual Att>.

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 77

Performance Tests Performance Test Instructions

Table 15 Wavelength and Power Settings for Power Flatness over Wavelength Tests

with Attenuation

Module Wavelength [λ] Power [P] Attenuation [Atten]

Agilent 81480A - Output 2 1420.000 nm −3.000 dBm 57.000 dB

Agilent 81680A - Output 2 1460.000 nm −3.000 dBm 57.000 dB

Agilent 81640A - Output 2 1510.000 nm −5.000 dBm 55.000 dB

Agilent 81682A #003 1460.000 nm −4.500 dBm 55.500 dB

Agilent 81642A #003 1510.000 nm −4.500 dBm 55.500 dB

4 Set the wavelength and power for each Tunable Laser m odule to th e

values given in Table Table 15.

5 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the high power output.

Set <Optical Output> to <High Power (2)>.

6 Set the power meter channel of the HP 8153A to the following

settings:

a Set range to -60 dBm. Press Up or Down as required.

b Set T, the averaging time, to 500 ms.

c Set the l, the wavelength, to the same as your Tunable Laser

module, as given in Table Table 14.

d Select dB as the power units.

7 Press the DISP->REF hardkey of the HP 8153A.

8 Increase the wavelength of the Tunable Laser module and of the

Power Meter to the next value listed in the test record.

9 Measure the output power. Note the result in the test record

10 Repeat steps 8 and 9 for the wavelength settings given in the test

record.

11 From the measurement results calculate the difference between the

maximum and minimum deviation from REF and note the result as

the Flatness.

12 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the High Power output.

Set <Optical Output> to <High Power (2)>.

13 Set wavelength and power as given in Table Table 14.

14 Repeat steps 6 to 11.

78 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Power Stability

Follow the steps below to measure the power stability:

1 Set up the equipment as shown in Figure 20.

2 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

3 Set the menu parameters to the values shown in Table Table 5.

4 Set th e wavelength and power for each Tunable Laser modu le to the

values given in Table Table 16.

Table 16 Wavelength and Power Settings for Power Stability Tests

Module Wave length [λ] Power [P]

Agilent 81480A - Output 1 1450.000 nm −13.000 dBm

Agilent 81480A - Output 2 1450.000 nm − 3.000 dBm (ATT = 0 dB )

Agilent 81680A - Output 1 1540.000 nm −13.000 dBm

Agilent 81680A - Output 2 1540.000 nm − 3.000 dBm (ATT = 0 dB )

Agilent 81640A - Output 1 1560.000 nm −13.00 dBm

Agilent 81640A - Output 2 1560.000 nm − 5.00 dBm (ATT = 0 dB)

Agilent 81682A 1540.000 nm − 3.000 dBm

Agilent 81682A #003 1540.000 nm − 5.500 dBm (ATT = 0 dB )

Agilent 81642A 1580.000 nm − 3.000 dBm

Agilent 81642A #003 1580.000 nm − 4.500 dBm (AT T = 0 d B )

Agilent 81689A 1540.000 nm − 3.00 dBm

5 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 1, the Low SSE output.

Set < Optical Output> to <Low SSE (1)>.

6 Ensure the optical output is switched off.

7 Set the power meter channel of the HP 8153A to the following

settings:

• Enable automatic ranging; press Auto as required.

• Set T, the averaging time, to 200 ms.

NOTE You should record measurements after a time interval of at least 3

seconds.

•Set the λ, the wavelength, to the same as your Tunable Laser

module, as given in Table Table 16.

• Select dB as the power units.

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Performance Tests Performance Test Instructions

• Set HP 8153A to Logging, T_Total 15 minutes:

a Press Menu.

b Press Record to get STABILIT Y.

c Press Edit to get T_TOTAL.

d Modify the display until it shows 0:15:00.

e Press Edit.

NOTE To test power stability, it is sufficient to set T_Total to 15 minutes

rather than 1 hour, to ensure that the power control loop works correctly.

8 Press the key beside the laser output to switch on the laser output

and wait 1 minute. For the Agilent 81480A, Agilent 81680A or the

Agilent 81640A, press the key beside Output 1, the Low SSE output,

or the key beside Output 2, the High Power output, as appropriate.

9 On the HP 8153A, press Exec.

Display will show RUNNING (blinking ) for a few moments and then

show the remaining time. When logging has finished the display will

show STABILITY.

10 To see the results:

a Press More to get SHOW.

b Press Edit to get MAXIMUM. Note the value in the test record.

c Press Next to get MINIMUM. Note the value in the test record.

d Press Edit, and Mode to return to normal operation.

11 Calculate the Stability by subtracting the MINIMUM from the

MAXIMUM.

12 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the high power output.

Set <Optical Output> to <High Power (2)>.

Th e n s et t he wave lengt h an d p ower to t h e v alue g iven in T able T able

16.

13 Repeat item list 6 to 11.

80 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Signal-to-Source Spontaneous Emission

See “Specifications” on page 39 for a definition of Signal-to-Source Spontaneous Emission.

Signal-to-Source Spontaneous Emission Tests - High Power Outputs

Follow this procedure to test modules with high power outputs:

• Agilent 81480A, Output 2, High Power

• Agilent 81680A, Output 2, High Power

• Agilent 81640A, Output 2, High Power

• Agilent 81682A standard model

• Agilent 81682A #003

• Agilent 81642A standard model

• Agilent 81642A #003

• Agilent 81689A

1 Connect the Tunable Laser module to the Optical Spectrum

Analyzer as shown in Figure 22.

Agilent 8164A Lightwave Measurement System

Tunable Laser

For #021, #071: use 81000AI, 81101AC and 81000AI For #022, #072: use 81000SI, 81113PC and 81000FI

Figure 22 Test Setup for the Source Spontaneous Emission Test - High Power Outputs

2 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect t he o n e end of the fiber t o O utput 2, the H i g h Powe r o u tput,

and the other to the Optical Spectrum Analyzer.

Optical Spectrum Analyzer

3 Initialize Optical Spectrum Analyzer: press Preset the green

hardkey and Auto Meas.

4 Set the Optical Spectrum Analyzer:

a Set Span to 4 nm. Press Span, enter the value.

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Performance Tests Performance Test Instructions

b Set the Resolution Bandwidth to 1 nm. Press [AMPL], press

[BW Swp], and enter the value.

c Set the Sensitivity to -60 dBm. Press [AMPL], press [SENS], and

enter the value.

d Set the wavelength to the value given for your Tunable Laser

module in Table Table 17.

5 Move to the Tunable Laser channel of the Agilent 8164A Lightwave

Measurement System and press [Menu].

6 Set the menu parameters to the values shown in Table Table 5.

7 If you are using the Agilent 81480A, Agilent 81680A or the

Agilent 81640A Tunable Laser module:

Connect the output fiber to Output 2, the High Power output.

Set <Optical Output> to <High Power (2)>.

8 Ensure the optical output is switched off.

9 Set the wavelength of your Tunable Laser module to the value given

in Table Table 17.

Table 17 Wavelength Settings for Source Spontaneous Emission Tests

Module Wavelength [λ]

Agilent 81480A - Output 2 1420.000 nm

Agilent 81680A - Output 2 1460.000 nm

Agilent 81640A - Output 2 1510.000 nm

Agilent 81682A 1460.000 nm

Agilent 81642A 1510.000 nm

Agilent 81689A 1525.000 nm

10 Set the power for each Tunable Laser module to the maximum

specified output power as given in the Test Record.

11 Press the key beside the laser output to switch on the laser output.

12 On the spectrum analyzer, set the Marker to the highest peak and

select delta. (Marker −> HIGHEST PEAK −> DELTA)

13 Using the MODIFY knob move the second marker to the highest

peak of the displayed side modes and note the difference, delta,

between the two markers in the Test Record.

14 Increase the wavelength of the Tunable Laser by 10 nm as specified

in the Test Record.

15 Repeat steps 11 to 13 within the wavelength range of the Tunable

Laser.

82 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Signal-to-Source Spontaneous Emission Tests - Low SSE Outputs

Follow this procedure to test modules with Low SSE high power outputs:

• Agilent 81480A, Output 1, Low SSE

• Agilent 81680A, Output 1, Low SSE

• Agilent 81640A, Output 1, Low SSE

The previous setup is limited by the dynamic range of the Optical Spectrum Analyzer. An improvement can be done by reducing the power of the spectral line of the Tunable Laser module by a filter, a Fiber Bragg Grating. However, by this approach, the measurement is limited to a single wavelength (that of the peak attenuation of the Fiber Bragg Grating):

The Fiber Bragg Grating has a straight connector on one end and a slanted connector on the other. Depending on the output connector option of your Tunable Laser module, the Device Under Test (DUT), the Fiber Bragg Grating should be connected with:

• a straight connector, if you use option #021 or #071, or

• the slanted connector, if you use option #022 or #072.

NOTE Because the Tunable Laser channel displays the wavelength in air and

the Optical Spectrum Analyzer displays the wavelength in a vacuum there is a mismatch between the values displayed by the two instruments.

A good approximation in this wavelength range is:

= λ

OSA

Use λ accuracy of the Tunable Laser modules is better than the OSA.

The accuracy of the offset value in this equ ation d oes not influence the measurement accuracy of spectral and total SSE measurements.

as primary reference because the specified wavelength

TLS

− 0.5 nm

TLS

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Performance Tests Performance Test Instructions

Figure 23 Transmission Characteristic of Fiber Bragg Grating

Figure 24 Signal-to-Spectral SSE Measurement

... λ

Lower Transmission Band

Upper Transmission Band

Attenuation Band

... λ

< 2 nm

1 Connect the Tunable Laser module (DUT) to the Optical Spectrum

Analyzer as shown in Figure 25. Connect the one end of the Fiber

Bragg Grating (FBG)

to Output 1, the Low SSE output, and the

other to the Optical Spectrum Analyzer.

81640A, 81680A: λ

81480A: λ

≈ 1407 nm

FBG

≈ 1520 nm

FBG

84 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Agilent 8164A Lightwave Measurement System

Optical Spectrum Analyzer

Tunable Laser

For #021, #071: use 81000FI and adapter DIN/DIN 1005-0255 and 81113PC and 81000FI For #022, #072: use 81000SI and 81000FI

Fiber Bragg

Grating

Figure 25 Test Setup for Source Spontaneous Emission Test

2 Determine the filter transmission characteristics:

a Check center wavelength, l

, of the Fiber Bragg Grating. This

FBG

wavelength is printed on its label, for example, 1520.5 nm. This value relates to measurements performed in a vacuum.

b Set the Optical Spectrum Analyzer:

• Set the Span to 8 nm. Press Span and enter the value.

• Set the center wavelength to λ

− 0.5 nm. Press Center and enter

FBG

the value.

• Set the reference level to 0 dBm. Press [AMPL], press [Ref LVL],

and enter the value.

• Set the Sensitivity to -68 dBm. Press [AMPL], press

[SENS AUTO MAN

], and enter the value.

• Set the resolution bandwidth to 0.1 nm. Press [BW Swp], and enter

the value.

c Set the Tunable Laser module

• Set [λ], the wavelength, to λ

− 1 nm, for example,

FBG

1520.5 nm − 1 nm = 1519.5 nm.

• Set [P], the output power, to the value in Table Table 18.

Table 18 Output Power Setting - Low SSE Output

Tunable Laser Module

Agilent 81480A - Output 1 -7

Power [P]

dBm

Agilent 81680A - Output 1 -6 dBm

Agilent 81640A - Output 1 -7 dBm

d Press the key beside the laser output to switch on the laser

output.

e Check and note the peak power level displayed by the OSA and

the wavelength at the peak power. Press Peak Search in the Marker field.

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Performance Tests Performance Test Instructions

f For l

Table 19 Filter Transmission Characteristic

Tunable Laser Module Output

Wavelength Relative to λ

FBG

−1.0 nm dBm nm

−0.9 nm dBm nm

−0.8 nm dBm nm

−0.7 nm dBm nm

−0.6 nm dBm nm

−0.5 nm dBm nm

−0.4 nm dBm nm

−0.3 nm dBm nm

−0.2 nm dBm nm

−0.1 nm dBm nm

± 1 n m , chec k a n d n ote the power l evel d isplayed b y t he

FBG

OSA at every 0.1 nm interval. That is, fill out the table shown in Table Table 19.

Associated Wavelength Dis-

Peak Power Level

played on OSA

±0nm = λ

FBG

dBm nm

+0.1 nm dBm nm

+0.2 nm dBm nm

+0.3 nm dBm nm

+0.4 nm dBm nm

+0.5 nm dBm nm

+0.6 nm dBm nm

+0.7 nm dBm nm

+0.8 nm dBm nm

+0.9 nm µW nm

+1.0 nm µW nm

3 Determine minimum value of filter transmission and actual Fiber-

Bragg-Grating center wavelength, λ

a Check for minimum transmitted peak power in Table Table 19.

b Mark the associated wavelength set on the Tunable Laser,

, and note the value in the test record.

TLS_l

86 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Performance Test Instructions Performance Tests

c Mark the associated wavelength displayed on the OSA, OSA_l0,

and note the value in the test record.

4 Set TLS to the wavelength of minimum transmission, TLS_λ

5 Record spectrum at minimum filter transmission. Set the Optical

Spectrum Analyzer:

a Set the Sensitivity to -90 dBm.

b Set the resolution bandwidth to 0.5 nm.

c Set the center wavelength to OSA_l

d Set the reference level to -40 dBm.

e Set the span to 6 nm.

6 Determine limits of transmission and attenuation ranges by

performing the following calculations:

f Lower Transmission Band:

l1 ... l

• TLS_λ1 = TLS_λ0 − 3nm

• TLS_λ

g Upper Transmission Band:

= TLS_λ0 − 0.5 × Attenuation Band

= TLS_λ

− 1nm

l3 ... l

• TLS_λ3 = TLS_λ0 + 0.5 × Attenuation Band

• TLS_λ

= TLS_λ

= TLS_λ0 + 0.5 × Upper Transmission Band

= TLS_λ

+ 1nm

+ 3nm

7 Determine maximum transmitted power value inside transmission

band:

Record spectrum:

Check for the maximum transmitted power (max_SSE_power)

within Lower and Upper Transmission Bands. Do this by using the marker. Change λ by using the RPG and note the maximum

power value within the Lower and Upper Transmission Bands

(this is one value for these bands together). Note this value in the

test record. Check the associated wavelength on OSA

(OSA@max_SSE_power) and note the value in the test record.

8 Set the marker of the OSA to OSA@max_SSE_power.

Change [λ], the output wavelength of the TLS, so that the peak

wavelength of the spectrum is at the OSA marker

Change [λ], the output wavelength of the TLS, to the wavelength of

highest SSE (TLS@max_SSE_power) using the approximation:

TLS@max_SSE_power = OSA@max_SSE_power + 0.5 nm

9 Determine TLS@max_SSE_power as follows:

Set the Optical Spectrum Analyzer:

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Performance Tests Performance Test Instructions

a Set the Sensitivity to -68 dBm.

b Set the resolution bandwidth to 0.5 nm.

c Set the center wavelength to OSA@max_SSE_power.

d Set the reference level to 0 dBm.

e Set the span to 6 nm.

f Record the spectrum.

10 Within the total spectrum, determine peak power

(power@SSE_peak) and note the value in the test record.

NOTE This is at the wavelength the TLS is set to for this measurement and

the OSA measures, respectively.

11 Calculate spectral SSE by using the following equation:

Spectral SSE = power@SSE_peak – ( max_SSE_power + 3 [dB/nm])

Note the value in the test record.

NOTE The measurements were done with a resolution bandwidth of 0.5 nm.

The additional value of 3 dB takes care of a resolution of 1 nm, thus to get the SSE in [dB/nm].

Signal-to-Total-Source Spontaneous Emission

Follow this procedure to test the Tunable Laser modules:

• Agilent 81480A

• Agilent 81680A

• Agilent 81640A

• Agilent 81682A

• Agilent 81642A

This test does not apply to the Agilent 81689A.

88 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Signal to Total SSE Measurement

Measured Spectrum

Output Power

Signal

Total SSE =

Wavelength/ nm

Signal to Total SSE Tests - Low SSE Outputs

Follow this procedure to test modules with low SSE outputs:

• Agilent 81480A, Output 1, the Low SSE output

• Agilent 81680A, Output 1, the Low SSE output

• Agilent 81640A, Output 1, the Low SSE output

1 Check center wavelength of Fiber Bragg Grating, FBG (λ_FBG)

which is printed on its label (for example, 1520.5 nm). This value

relates to vacuum conditions.

2 Determine OSA noise, that is, the noise of OSA alone without

applying the Tunable Laser signal:

a Switch off the laser output of the Tunable Laser.

b Set the OSA

• Set the Span to 30 nm. Press Span and enter the value.

• Set the center wavelength, OSA_λ_center, to λ

− 0.5 nm. Press

FBG

Center and enter the value.

• Set the reference level to −40 dBm. Press [AMPL], press [Ref

LVL], and enter the value.

• Set the Sensitivity to −90 dBm. Press [AMPL], press

[SENS AUTO MAN

], and enter the value.

• Set the resolution bandwidth to 1 nm. Press [BW Swp], and enter

the value.

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Performance Tests Performance Test Instructions

c Record noise spectrum for a single sweep.

d Measure partial noise of the spectrum.

With a sampling step of 1 nm on the OSA, check all 201 power levels within the recorded spectrum, sta rting at OSA_l_center – 15 nm and finishing at OSA_l_center + 15 nm.

NOTE Note the “partial noise power level” values in a table in [pW], where

1 pW = 10

Example:

Table 20 Signal to Total SSE Tests - Low SSE Outputs

Wavelength,

Relative to OSA_λ_center Partial Noise Power levels

−15 nm pW

−14 nm pW

−13nm pW

…. pW

−2nm pW

−1nm pW

−12

±0nm (= OSA_λ_center) pW

+1 nm pW

+2 nm pW

…. pW

+13 nm pW

+14 nm pW

+ 15 nm pW

Sum of all partial noise power levels pW

e Determine total noise power by adding up all 31 partial noise

power levels: OSA_noise = Sum of all partial noise power levels

OSA_noise = _________ pW

f Note the OSA_noise value in the test record.

3 Connect the Tunable Laser (DUT) to the Optical Spectr um Analyzer

as shown in Figure 25. Connect one end of the Fiber Bragg Grating

to Output 1,the Low SSE output of the TLS and the other to the

Optical Spectrum Analyzer.

4 Set the TLS menu parameters to the values shown in Table Table 5.

90 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

5 Set the power for each Tunable Laser module to the values given in

Table Table 21.

NOTE For the Agilent 81480A and Agilent 81640A, the laser ouput power is

limited to its maximum possible value at this wavelength. The display will probably show ExP.

Table 21 Power Settings for Signal to Total SSE Tests - Low SSE Outputs

Module Power [P]

Agilent 81480A - Output 1 −7.00 dBm

Agilent 81680A - Output 1 −6.00 dBm

Agilent 81640A - Output 1 −7.00 dBm

6 Determine filter transmission characteristic (see Signal-to-Source

Spontaneous Emission Tests - Low SSE Outputs on page 83). You

may skip t his step if th e characteristic has al ready been determined .

a Determine minimum value of filter transmission and actual FBG

center wavelength l0 (see step 3 on page 86). You may skip this step if the characteristic has already been determined.

b Note the wavelength of minimum transmitted peak power the

TLS is set to in the test record

TLS_l0 = ________ nm

c Mark the associated wavelength displayed on the OSA (OSA_l0)

and note the value in the test record

OSA_l0 = ________ nm

7 Record spectrum at minimum filter transmission:

Set TLS to the wavelength of minimum transmission (TLS_λ0)

Check that the laser output is activated.

8 Set the Optical Spectrum Analyzer:

a Set Span to 30 dBmnm. Press Span, enter the value.

b Set the Resolution Bandwidth to 1 nm. Press [AMPL], press [BW

Swp], and enter the value.

c Set the Sen sitiv i t y to -90 d B m. Press [AM P L], press [SENS], an d

enter the value.

d Set the center wavelength to OSA_l0. Press Center and ent e r t he

value.

e Set the reference level to -40 dBm. Press [AMPL], press [Ref

LVL], and enter the value.

9 Determine limits of SSE range by performing the following

calculations:

a Lower Transmission Band:

l1 ... l

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Performance Tests Performance Test Instructions

• OSA_λ

b Upper Transmission Band:

= OSA_λ0 − 15 nm

= OSA_λ0 − 1/2 × Attenuation Band

= OSA_λ

− 1nm

l3 ... l

• OSA_λ3 = OSA_λ0 + 1/2 × Attenuation Band

• OSA_λ

= OSA_λ

= OSA_λ0 + Upper Transmission Band

= OSA_λ

+ 1nm

+ 15 nm

c Note the values of OSA_l1, OSA_l2, OSA_l3, OSA_l4 in the test

record:

• OSA_λ

= ___________ nm

10 Determine SSE power values inside the transmission bands:

a Ensure the TLS is set to TLS_l0 and is not changed.

b On OSA, set marker to OSA_l1.

c Check the OSA and note SSE power value in [pW] in the table

below as SSE_power.

d Increase OSA marker wavelength by 1 nm.

e Repeat steps c and d until the wavelength is equal to OSA_l2.

f Set OSA to OSA_l3.

g Repeat steps c and d until the wavelength is equal to OSA_l4.

h Add up all power values inside the transmissions bands to get

the value of power_trans.

NOTE Note all the power values in the table in [pW], where 1 pW = 10

Example:

Lower transmission band

OSA_λ1 to OSA_λ2

Relative Wavelength,

Increments

from λ_1

Relative Wavelength,

SSE_power mea-

sured

Upper transmission band

OSA_λ3 to OSA_λ4

Increments

from λ_3

SSE_power mea-

sured

0 (relates to OSA_λ1) pW 0 (relates to λ_3) pW

+1 nm pW + 1 nm pW

+2 nm pW + 2 nm pW

−12

92 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

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Performance Test Instructions Performance Tests

Lower transmission band

OSA_λ1 to OSA_λ2

Relative Wavelength,

Increments

from λ_1

Relative Wavelength,

SSE_power mea-

sured

Upper transmission band

OSA_λ3 to OSA_λ4

Increments

from λ_3

SSE_power mea-

+3 nm pW + 3 nm pW

+4 nm pW + 4 nm pW

…. …. …. ….

+11 nm pW +11 nm pW

+12 nm pW +12 nm pW

sured

+13 nm pW +13 nm pW

+14 nm

(relates to OSA_λ2)

pW +14 nm

(relates to OSA_λ4)

Sum of all SSE power levels:

• in lower transmission band ________ pW (1)

• in upper transmission band ________ pW (2)

Sum of all SSE power levels in transmission bands, add results in (1) and (2) power_trans = ___________ pW

11 Determine SSE power inside the attenuation band by interpolation:

a Check the power measured at OSA_l2 and OSA_l3.

b Ma r k t h at p owe r v a lu e w hic h is t he l arg e st o f bo t h a nd n o te it a s

power_ OSA_l2,3_max

c Calculate the power inside the attenuation band by using

power_att = 1/2 ¥ power_ OSA_l2,3_max

= ___________ 10

-12

W = ___________ pW

NOTE Note all the power values in [pW], where 1 pW = 10

−12

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Performance Tests Performance Test Instructions

12 Determine total noise power, power_total_noise. Add the value of

the power_trans and the value of power_att:

power_total_noise= power_trans + power_att

= ___________ 10

-12

W = ___________ pW

13 Determine Peak power:

a Set the OSA:

• Set the Span to 30 nm. Press Span and enter the value.

• Set the center wavelength to OSA_λ0. Press Center and enter the

value .

• Set the reference level to 0 dBm. Press [AMPL], press [Ref LVL],

and enter the value.

• Set the Sensitivity to −68 dBm. Press [AMPL], press

[SENS AUTO MAN

], and enter the value.

• Set the resolution bandwidth to 1 nm. Press [BW Swp], and enter

the value.

b Set the TLS:

• Set the wavelength to a value outside attenuation band. That is, set

it to TLS_λ0 + 5 nm.

• Set the output power to the value in Table Table 21.

• Ensure the laser output is activated.

c Record the spectrum for a single sweep.

NOTE Note all the power values in [pW], where 1 pW = 10

−12

d Find the maximum power level for the whole spectrum,

power_SSE_peak, and ent er the result in the test record in [pW]: Peak_power = ___________ 10

-12

W = ___________ pW

14 Calculate total SSE and express in decibels, [dB].

Total SSE 10

---------- ------------- ------------- ------------ ------------- ------------- -----------log×=

power total noi se OSA noise–

peak power

NOTE Make sure that all power values are entered in the same units, for

example Watts, W, or picowatts, pW. This ensures that the equation will give Total SSE in decibels, dB.

15 Note the result in the test record:

Total SSE = ________________ dB

94 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

Optional Test

Signal to Total SSE Tests - High Power Outputs

Follow this optional procedure to test modules with high power outputs:

• Agilent 81480A, Output 2, the High Power output

• Agilent 81680A, Output 2, the High Power output

• Agilent 81640A, Output 2, the High Power output

• Agilent 81682A, standard model

• Agilent 81682A, #003

• Agilent 81642A, standard model

• Agilent 81642A, #003

1 Connect the Tunable Laser module (DUT) to the Optical Spectrum

Analyzer as shown in Figure 22. For the Agilent 81640A and Agilent

81680A make sure to connect Output 2, the High Power output, to

the Optical Spectrum Analyzer.

2 Set the TLS menu parameters to the values shown in Table Table 5.

3 Set th e wavelength and power for each Tunable Laser modu le to the

values given in Table Table 22.

Table 22 TLS Settings for Signal to Total SSE Tests - High Power Outputs

Module Power [P] Wavelength [λ]

Agilent 81480A - Output 2 +3.00dBm 1420nm

Agilent 81680A - Output 2 +5.00dBm 1530nm

Agilent 81640A - Output 2 +2.00dBm 1530nm

Agilent 81682A - Standard +6.00dBm 1530nm

Agilent 81682A - #003 +4.50dBm 1530nm

Agilent 81642A - Standard +4.00dBm 1530nm

Agilent 81642A - #003 +2.50dBm 1530nm

4 Set the Optical Spectrum Analyzer:

a Set Span to 30 nm. Press Span, enter the value.

b Set the Resolution Bandwidth to 1 nm. Press [AMPL], press [BW

Swp], and enter the value.

c Set the Sen sitiv i t y to -60 d B m. Press [AM P L], press [SENS], an d

enter the value.

5 Record Spectrum (run a single sweep):

Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 95

Performance Tests Performance Test Instructions

a Press Peak Search in the Marker field.

b Set Marker to Center Wavelength and note its displayed

wavelength as:

OSA_l_center = ________________ nm

6 Find the maximum power level at OSA_λ_center, peak_power, and

enter the result in the test record in [pW]:

Peak_power = ___________ 10

7 Measure partial noise of the spectrum.

With a sampling step of 1 nm on the OSA, check all 30 power levels

within the recorded spectrum, starting at OSA_λ_center – 15 nm and finishing at OSA_λ_center + 15 nm without recording a value at OSA_λ_center.

-12

W = ___________ pW

NOTE Note the “partial noise power level” values in the table in [pW], where

1 pW = 10

Example:

−12

Wavelength,

Relative to OSA_λ_center Partial Noise Power levels

−15 nm pW

−14 nm pW

−13 nm pW

…. pW

−2nm pW

−1nm pW

+/− 0 nm (= OSA_λ_center) pW

+1 nm pW

+ 2 nm pW

…. pW

+13 nm pW

+14 nm pW

+15 nm pW

Sum of all partial noise power levels: pW

96 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Performance Test Instructions Performance Tests

8 Determine total noise power by adding up all 30 partial noise

power levels:

OSA_noise = Sum of all partial noise power levels

OSA_noise = _________ pW

9 Note the OSA_noise value in the test record.

10 Determine SSE of the Tunable-Laser output signal by using the

maximum value at its border:

a Note the power measured at:

OSA_l_center - 1 nm

b Note the power measured at:

OSA_l_center + 1 nm

c Determine the larger of these two power values and note it as

SSE_power_lTLS_max.

−12

NOTE Note all the power values in [pW], where 1 pW = 10

-12

d SSE_power_lTLS_max= ________ 10

W = _______ pW

11 Determine the Total SSE power, power_total_SSE.

Add the values of OSA_noise and SSE_power_λTLS_max:

power_total_SSE = OSA_noise + SSE_power_λTLS_max

= ___________ 10

-12

W = ___________ pW

12 Calculate the Total SSE in [dB] by using the following formula:

Total SSE 10

peak power

------------- ------------- ------------ --------log×=

power total SSE

NOTE Mak e s u re you tha t a ll value s a r e p o wer valu e s are entered in the sam e

units, for example Watts, W, or picowatts, pW. This ensures that the equation will give Total SSE in decibels, dB.

13 Note the result in the test record:

Total SSE = _____________________ dB

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Performance Tests Performance Test Instructions

98 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Te s t R ec o rd Performance Tests

Test Record

Agilent 81480A Performance Test

Page 1 of 13

Test Facility:

________________________________ Report No. _________________

________________________________ Date _________________

________________________________ Customer _________________

________________________________ Tested By _________________

Model Agilent 81480A Tunable Laser Module 1400 nm

Serial No. ____________________ Ambient temperature ________°C

Options ____________________ Relative humidity ________ %

Firmware Rev. ____________________ Line frequency ________ Hz

Special Notes:

_________________________________________________________________

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Performance Tests Test R ec o r d

Agilent 81480A Performance Test

Page 2 of 13

Model Agilent 81480A Tunable Laser Report No. ________ Date_______

Tes t E qui pm en t Us ed

Description Model No. Trace No. Cal. Due Date

1. Lightwave Measurement System Agilent 8164A ________ _________

2. Lightwave Multimeter HP 8153A _________ _________

3. Optical Head Interface Module HP 81533B _________ _________

4. Standard Optical Head ___________ _________ _________

5. Optical Spectrum Analyzer ___________ _________ _________

6. Wavelength Meter ___________ _________ _________

7. __________________________ ___________ _________ _________

8. __________________________ ___________ _________ _________

9. __________________________ ___________ _________ _________

10. __________________________ ___________ _________ _________

11. __________________________ ___________ _________ _________

12. __________________________ ___________ _________ _________

13. __________________________ ___________ _________ _________

14. __________________________ ___________ _________ _________

15. __________________________ ___________ _________ _________

100 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide,

Sixth Edition

Agilent Technologies 81480A, 81640A, 81642A, 81680A, 81689A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety Summary

Safety Symbols

Initial Inspection

Line Power Requirements

Operating Environment

Input/Output Signals

Storage and Shipment

Initial Safety Information for Tunable Laser Modules

Laser Safety Labels

The Structure of this Manual

Conventions used in this manual

Getting Started with Tunable Laser Sources

What is a Tunable Laser ?

Optical Output

Polarization Maintaining Fiber

Angled and Straight Contact Connectors

Signal Input and Output

Accessories

Modules and Options

Modules

User’s Guides

Options

Connector Interfaces and Other Accessories

Options 071, 021: Straight Contact Connectors

Specifications

Definition of Terms

Absolute Wavelength Accuracy

Effective Linewidth

Linewidth

Minimum Output Power

Mode-Hop Free Tuning Range

Modulation Extinction Ratio

Modulation Frequency Range

Output Power

Output Isolation

Peak Power

Polarization Extinction Ratio

Power Flatness Over Modulation

Power Flatness Versus Wavelength

Power Linearity

Power Repeatability

Power Stability

Relative Intensity Noise (RIN)

Relative Wavelength Accuracy

Return Loss

Sidemode Suppression Ratio

Signal-to-Source Spontaneous Emission (SSE) Ratio

Signal-to-Total-Source Spontaneous Emission

Wavelength Range

Wavelength Repeatability

Wavelength Resolution

Wavelength Stability

Tunable Laser Module Specifications

Supplementary Performance Characteristics

Operating Modes

General

Performance Tests

Required Test Equipment

Tes t Re co rd

Test Failure

Instrument Specification

Performance Test Instructions

General Test Setup

Wavelength Tests

Wavelength Accuracy

Wavelength Repeatability

Power Tests

Power Linearity

Power Flatness over Wavelength

Power Stability

Signal-to-Source Spontaneous Emission

Signal-to-Total-Source Spontaneous Emission

Test Record

Agilent 81480A Performance Test

Tes t E qui pm en t Us ed